diff --git a/psage/ellcurve/galrep/tests.py b/psage/ellcurve/galrep/tests.py
index f88821e2..36ab42b0 100644
--- a/psage/ellcurve/galrep/tests.py
+++ b/psage/ellcurve/galrep/tests.py
@@ -1,5 +1,5 @@
 from __future__ import absolute_import
-from builtins import range
+
 def test_nonsurj(v=list(range(1,50))):
     """
     For each non CM curve of conductor in the list v, compute the
diff --git a/psage/ellcurve/lseries/lseries_nf.py b/psage/ellcurve/lseries/lseries_nf.py
index 5c3d538e..1f2dd7e4 100644
--- a/psage/ellcurve/lseries/lseries_nf.py
+++ b/psage/ellcurve/lseries/lseries_nf.py
@@ -46,7 +46,7 @@
 from __future__ import absolute_import
 from __future__ import division
 
-from builtins import range
+
 import math
 
 from sage.all import (PowerSeriesRing, Integer, factor, QQ, ZZ,
diff --git a/psage/function_fields/category.py b/psage/function_fields/category.py
index 818ae46c..cc6a7eed 100644
--- a/psage/function_fields/category.py
+++ b/psage/function_fields/category.py
@@ -23,7 +23,7 @@
 """
 
 
-from builtins import object
+
 from sage.categories.category import Category
 from sage.misc.cachefunc import cached_method
 from sage.categories.basic import Fields
diff --git a/psage/function_fields/function_field.py b/psage/function_fields/function_field.py
index d82ae4db..ca872b80 100644
--- a/psage/function_fields/function_field.py
+++ b/psage/function_fields/function_field.py
@@ -60,7 +60,7 @@
 """
 from __future__ import absolute_import, division
 
-from builtins import range
+
 
 from sage.structure.category_object import CategoryObject
 from sage.rings.ring import Field
diff --git a/psage/lmfdb/collection.py b/psage/lmfdb/collection.py
index 2a6d47f5..db7270db 100644
--- a/psage/lmfdb/collection.py
+++ b/psage/lmfdb/collection.py
@@ -26,7 +26,7 @@
 """
 from __future__ import print_function
 
-from builtins import object
+
 class Collection(object):
     def __init__(self, collection, db):
         self.collection = collection
diff --git a/psage/lmfdb/converter.py b/psage/lmfdb/converter.py
index a4a162c2..0ff433da 100644
--- a/psage/lmfdb/converter.py
+++ b/psage/lmfdb/converter.py
@@ -36,7 +36,7 @@
 order to not tie the database too tightly to Sage.
 """
 
-from builtins import object
+
 class DBConverter(object):
     def from_dirichlet_character(self, e):
         zeta_order = int(e.parent().base_ring().zeta_order())
diff --git a/psage/lmfdb/ellcurves/L0s.py b/psage/lmfdb/ellcurves/L0s.py
index 332cb340..4c3b95f2 100644
--- a/psage/lmfdb/ellcurves/L0s.py
+++ b/psage/lmfdb/ellcurves/L0s.py
@@ -20,8 +20,8 @@
 #
 #################################################################################
 
-from builtins import str
-from builtins import range
+
+
 import sage.parallel.ncpus
 from psage.lmfdb.auth import userpass
 
diff --git a/psage/lmfdb/ellcurves/ap.py b/psage/lmfdb/ellcurves/ap.py
index 0fcca623..ed6729b7 100644
--- a/psage/lmfdb/ellcurves/ap.py
+++ b/psage/lmfdb/ellcurves/ap.py
@@ -20,8 +20,8 @@
 #
 #################################################################################
 
-from builtins import str
-from builtins import range
+
+
 import sage.parallel.ncpus
 from psage.lmfdb.auth import userpass
 
diff --git a/psage/lmfdb/ellcurves/sqrt5/aplists.py b/psage/lmfdb/ellcurves/sqrt5/aplists.py
index 08ef95a7..a5099762 100644
--- a/psage/lmfdb/ellcurves/sqrt5/aplists.py
+++ b/psage/lmfdb/ellcurves/sqrt5/aplists.py
@@ -20,7 +20,7 @@
 #
 #################################################################################
 
-from builtins import range
+
 def str_to_apdict(s, labels):
     return dict([(labels[a], int(b)) for a,b in enumerate(s.split()) if b != '?'])
 
diff --git a/psage/lmfdb/ellcurves/sqrt5/util.py b/psage/lmfdb/ellcurves/sqrt5/util.py
index d4ab7769..caf6cafd 100644
--- a/psage/lmfdb/ellcurves/sqrt5/util.py
+++ b/psage/lmfdb/ellcurves/sqrt5/util.py
@@ -20,7 +20,7 @@
 #
 #################################################################################
 
-from builtins import str
+
 def ellcurves_sqrt5(address='localhost:29000', username=None, password=None):
     from sage.databases.cremona import cremona_letter_code
     from psage.modform.hilbert.sqrt5.sqrt5 import F
diff --git a/psage/lmfdb/ellcurves/two_selmer.py b/psage/lmfdb/ellcurves/two_selmer.py
index f3a904cc..7a1b60ff 100644
--- a/psage/lmfdb/ellcurves/two_selmer.py
+++ b/psage/lmfdb/ellcurves/two_selmer.py
@@ -21,7 +21,7 @@
 #################################################################################
 
 
-from builtins import range
+
 from sage.all import mwrank_EllipticCurve
 from psage.lmfdb.auth import userpass
 
diff --git a/psage/lmfdb/mfdb.py b/psage/lmfdb/mfdb.py
index 9f77f1c2..2614d30b 100644
--- a/psage/lmfdb/mfdb.py
+++ b/psage/lmfdb/mfdb.py
@@ -37,7 +37,7 @@
 from __future__ import print_function
 from __future__ import absolute_import
 
-from builtins import object
+
 class MFDB(object):
     def __init__(self, host='localhost', port=29000):
         # Open connection to the MongoDB
diff --git a/psage/lmfdb/newforms.py b/psage/lmfdb/newforms.py
index c01bb3d1..2cc6aed3 100644
--- a/psage/lmfdb/newforms.py
+++ b/psage/lmfdb/newforms.py
@@ -37,7 +37,7 @@ class is instantiated by the main MFDB database object.
 from __future__ import print_function
 from __future__ import absolute_import
 from .populate import Populate
-from builtins import str
+
 from .collection import Collection
 
 class NewformCollection(Collection):
diff --git a/psage/lmfdb/objectdb.py b/psage/lmfdb/objectdb.py
index f0c0fe25..f2ec90d4 100644
--- a/psage/lmfdb/objectdb.py
+++ b/psage/lmfdb/objectdb.py
@@ -29,7 +29,7 @@
 MongoDB.
 """
 
-from builtins import object
+
 class ObjectDB(object):
     def __init__(self, db):
         from gridfs import GridFS
diff --git a/psage/lmfdb/populate.py b/psage/lmfdb/populate.py
index 36493ed8..9aa15cf5 100644
--- a/psage/lmfdb/populate.py
+++ b/psage/lmfdb/populate.py
@@ -29,7 +29,7 @@
 """
 from __future__ import print_function
 
-from builtins import object
+
 class Populate(object):
     def __init__(self, collection):
         self.collection = collection
diff --git a/psage/lmfdb/sqlite_keyval.py b/psage/lmfdb/sqlite_keyval.py
index 71666de5..7ca2c006 100644
--- a/psage/lmfdb/sqlite_keyval.py
+++ b/psage/lmfdb/sqlite_keyval.py
@@ -26,9 +26,9 @@
 """
 
 from builtins import next
-from builtins import str
-from builtins import range
-from builtins import object
+
+
+
 import sqlite3
 import zlib
 try:
diff --git a/psage/lseries/eulerprod.py b/psage/lseries/eulerprod.py
index e49e73eb..8f79762e 100644
--- a/psage/lseries/eulerprod.py
+++ b/psage/lseries/eulerprod.py
@@ -36,9 +36,9 @@
 #
 #################################################################################
 
-from builtins import str
-from builtins import range
-from builtins import object
+
+
+
 import copy
 import math
 import types
diff --git a/psage/lseries/triple_prod/triple.py b/psage/lseries/triple_prod/triple.py
index b4f07a99..19832caa 100644
--- a/psage/lseries/triple_prod/triple.py
+++ b/psage/lseries/triple_prod/triple.py
@@ -38,8 +38,8 @@
 #################################################################################
 
 
-from builtins import range
-from builtins import object
+
+
 from sage.all import ZZ, RDF, CDF
 R_cdf = CDF['x']
 
diff --git a/psage/matrix/tests.py b/psage/matrix/tests.py
index e53e18a4..1bcd8f7e 100644
--- a/psage/matrix/tests.py
+++ b/psage/matrix/tests.py
@@ -20,7 +20,7 @@
 #
 #################################################################################
 
-from builtins import range
+
 from sage.rings.complex_mpc import MPComplexField
 from sage.all import ZZ, MatrixSpace,Matrix
 from .matrix_complex_dense import random_unitary_matrix
diff --git a/psage/modform/arithgroup/mysubgroup.py b/psage/modform/arithgroup/mysubgroup.py
index 80ac5ebe..011624b3 100644
--- a/psage/modform/arithgroup/mysubgroup.py
+++ b/psage/modform/arithgroup/mysubgroup.py
@@ -61,8 +61,8 @@
 
 #from sage.all_cmdline import *   # import sage library
 
-from builtins import str
-from builtins import range
+
+
 from sage.arith.all import xgcd,gcd,CRT_basis
 from sage.rings.all import Integer,CC,ZZ,QQ,RR,RealNumber,infinity,Rational,Infinity,RealField
 from sage.rings.real_mpfr import RealNumber as RealNumber_class
diff --git a/psage/modform/arithgroup/plot_dom.py b/psage/modform/arithgroup/plot_dom.py
index a52af373..b7b4effb 100644
--- a/psage/modform/arithgroup/plot_dom.py
+++ b/psage/modform/arithgroup/plot_dom.py
@@ -4,9 +4,9 @@
 r"""
 from __future__ import print_function
 from __future__ import division
-from builtins import str
-from builtins import range
-from builtins import object
+
+
+
 import matplotlib
 import matplotlib.patches as patches
 import matplotlib.path as path
diff --git a/psage/modform/fourier_expansion_framework/gradedexpansions/expansion_lazy_evaluation.py b/psage/modform/fourier_expansion_framework/gradedexpansions/expansion_lazy_evaluation.py
index c804a4b2..2c357869 100644
--- a/psage/modform/fourier_expansion_framework/gradedexpansions/expansion_lazy_evaluation.py
+++ b/psage/modform/fourier_expansion_framework/gradedexpansions/expansion_lazy_evaluation.py
@@ -24,7 +24,7 @@
 #
 #===============================================================================
 
-from builtins import object
+
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_lazyelement import EquivariantMonoidPowerSeries_lazy
 
 def LazyFourierExpansionEvaluation(parent, element, precision) :
diff --git a/psage/modform/fourier_expansion_framework/gradedexpansions/expansion_module.py b/psage/modform/fourier_expansion_framework/gradedexpansions/expansion_module.py
index 611caacd..218ece5c 100644
--- a/psage/modform/fourier_expansion_framework/gradedexpansions/expansion_module.py
+++ b/psage/modform/fourier_expansion_framework/gradedexpansions/expansion_module.py
@@ -24,9 +24,9 @@
 #
 #===============================================================================
 
-from builtins import str
-from builtins import range
-from builtins import object
+
+
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.expansion_lazy_evaluation import LazyFourierExpansionEvaluation
 from psage.modform.fourier_expansion_framework.gradedexpansions.fourierexpansionwrapper import FourierExpansionWrapper
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ring import EquivariantMonoidPowerSeriesAmbient_abstract, MonoidPowerSeriesAmbient_abstract
diff --git a/psage/modform/fourier_expansion_framework/gradedexpansions/fourierexpansionwrapper.py b/psage/modform/fourier_expansion_framework/gradedexpansions/fourierexpansionwrapper.py
index dac8a221..d2c84215 100644
--- a/psage/modform/fourier_expansion_framework/gradedexpansions/fourierexpansionwrapper.py
+++ b/psage/modform/fourier_expansion_framework/gradedexpansions/fourierexpansionwrapper.py
@@ -24,7 +24,7 @@
 #
 #===============================================================================
 
-from builtins import object
+
 class FourierExpansionWrapper(object) :
     r"""
     Abstract class for elements, which do not represent Fourier
diff --git a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_ambient.py b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_ambient.py
index 5b9a9d8b..724e9fc8 100644
--- a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_ambient.py
+++ b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_ambient.py
@@ -24,8 +24,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import object
+
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_functor import \
             GradedExpansionFunctor, GradedExpansionEvaluationHomomorphism
 from operator import xor
diff --git a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_element.py b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_element.py
index 25558cac..16120375 100644
--- a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_element.py
+++ b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_element.py
@@ -24,8 +24,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
+
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.fourierexpansionwrapper import FourierExpansionWrapper
 from itertools import groupby
 from sage.structure.element import AlgebraElement
diff --git a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_functor.py b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_functor.py
index 0d0c05d9..6dc81653 100644
--- a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_functor.py
+++ b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_functor.py
@@ -26,7 +26,7 @@
 #===============================================================================
 
 from builtins import next
-from builtins import map
+
 from itertools import groupby, dropwhile
 from sage.algebras.algebra import Algebra
 from sage.categories.morphism import Morphism
diff --git a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_grading.py b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_grading.py
index 65daad4e..5d53ff9c 100644
--- a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_grading.py
+++ b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_grading.py
@@ -24,9 +24,9 @@
 #
 #===============================================================================
 
-from builtins import str
-from builtins import map
-from builtins import range
+
+
+
 from operator import mul
 from operator import xor
 from sage.misc.latex import latex
diff --git a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_module.py b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_module.py
index 36a5bfed..a112e709 100644
--- a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_module.py
+++ b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_module.py
@@ -25,7 +25,7 @@
 #===============================================================================
 
 from builtins import zip
-from builtins import range
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_ambient import GradedExpansionAmbient_abstract
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_element import GradedExpansionVector_class
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_ring import GradedExpansionRing_class
diff --git a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_ring.py b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_ring.py
index 56bbd8a7..a678b422 100644
--- a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_ring.py
+++ b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_ring.py
@@ -25,7 +25,7 @@
 #===============================================================================
 
 from builtins import zip
-from builtins import range
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_ambient import GradedExpansionAmbient_abstract
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_element import GradedExpansion_class
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_functor import GradedExpansionBaseringInjection
diff --git a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_submodule.py b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_submodule.py
index c1f5710c..277298db 100644
--- a/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_submodule.py
+++ b/psage/modform/fourier_expansion_framework/gradedexpansions/gradedexpansion_submodule.py
@@ -24,9 +24,9 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import str
-from builtins import range
+
+
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.expansion_lazy_evaluation import LazyFourierExpansionEvaluation
 from psage.modform.fourier_expansion_framework.gradedexpansions.expansion_module import ExpansionModule_abstract
 from psage.modform.fourier_expansion_framework.gradedexpansions.expansion_module import ExpansionModule_generic, ExpansionModule_ambient_pid, \
diff --git a/psage/modform/fourier_expansion_framework/modularforms/modularform_ambient.py b/psage/modform/fourier_expansion_framework/modularforms/modularform_ambient.py
index 90eeae38..7c3946e1 100644
--- a/psage/modform/fourier_expansion_framework/modularforms/modularform_ambient.py
+++ b/psage/modform/fourier_expansion_framework/modularforms/modularform_ambient.py
@@ -24,7 +24,7 @@
 #
 #===============================================================================
 
-from builtins import object
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_module import GradedExpansionModule_class
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_ring import GradedExpansionRing_class
 from psage.modform.fourier_expansion_framework.modularforms.modularform_element import ModularForm_generic
diff --git a/psage/modform/fourier_expansion_framework/modularforms/modularform_element.py b/psage/modform/fourier_expansion_framework/modularforms/modularform_element.py
index 215f1492..03c69c9f 100644
--- a/psage/modform/fourier_expansion_framework/modularforms/modularform_element.py
+++ b/psage/modform/fourier_expansion_framework/modularforms/modularform_element.py
@@ -1,4 +1,4 @@
-from builtins import object
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_ambient import GradedExpansionAmbient_abstract
 r"""
 A orthogonal modular form, namely a graded expansion providing additional features.
diff --git a/psage/modform/fourier_expansion_framework/modularforms/modularform_interfaces.py b/psage/modform/fourier_expansion_framework/modularforms/modularform_interfaces.py
index 60d7664f..d761469d 100644
--- a/psage/modform/fourier_expansion_framework/modularforms/modularform_interfaces.py
+++ b/psage/modform/fourier_expansion_framework/modularforms/modularform_interfaces.py
@@ -25,7 +25,7 @@
 #
 #===============================================================================
 
-from builtins import object
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_element import GradedExpansion_abstract
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_element import MonoidPowerSeries_abstract, \
                                                         EquivariantMonoidPowerSeries_abstract
diff --git a/psage/modform/fourier_expansion_framework/modularforms/modularform_submodule.py b/psage/modform/fourier_expansion_framework/modularforms/modularform_submodule.py
index e017310f..46c7a971 100644
--- a/psage/modform/fourier_expansion_framework/modularforms/modularform_submodule.py
+++ b/psage/modform/fourier_expansion_framework/modularforms/modularform_submodule.py
@@ -24,8 +24,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import object
+
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_ambient import GradedExpansionAmbient_abstract
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_submodule import GradedExpansionSubmodule_ambient_pid, \
                                                        GradedExpansionSubmodule_submodule_pid, \
diff --git a/psage/modform/fourier_expansion_framework/modularforms/modularform_testtype.py b/psage/modform/fourier_expansion_framework/modularforms/modularform_testtype.py
index 4ecfb140..bcb441d6 100644
--- a/psage/modform/fourier_expansion_framework/modularforms/modularform_testtype.py
+++ b/psage/modform/fourier_expansion_framework/modularforms/modularform_testtype.py
@@ -25,8 +25,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
+
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_grading import DegreeGrading
 from psage.modform.fourier_expansion_framework.modularforms.modularform_ambient import ModularFormsRing_generic,\
     ModularFormsModule_generic
diff --git a/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_ambient.py b/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_ambient.py
index be895415..8f28122b 100644
--- a/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_ambient.py
+++ b/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_ambient.py
@@ -24,7 +24,7 @@
 #
 #===============================================================================
 
-from builtins import object
+
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_element import MonoidPowerSeries, EquivariantMonoidPowerSeries
 from sage.rings.all import Integer
 from sage.structure.element import Element
diff --git a/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_basicmonoids.py b/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_basicmonoids.py
index bacbd06d..4cef7e7c 100644
--- a/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_basicmonoids.py
+++ b/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_basicmonoids.py
@@ -25,7 +25,7 @@
 #
 #===============================================================================
 
-from builtins import range
+
 from operator import xor
 from sage.misc.latex import latex
 from sage.categories.all import Rings
diff --git a/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_element.py b/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_element.py
index 153cc312..9efee726 100644
--- a/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_element.py
+++ b/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_element.py
@@ -24,7 +24,7 @@
 #
 #===============================================================================
 
-from builtins import object
+
 from copy import copy
 from sage.structure.element import AlgebraElement
 from sage.misc.latex import latex
diff --git a/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_lazyelement.py b/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_lazyelement.py
index cc04f2d2..e843cc06 100644
--- a/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_lazyelement.py
+++ b/psage/modform/fourier_expansion_framework/monoidpowerseries/monoidpowerseries_lazyelement.py
@@ -24,7 +24,7 @@
 #
 #===============================================================================
 
-from builtins import object
+
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ambient import EquivariantMonoidPowerSeriesAmbient_abstract
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_element import EquivariantMonoidPowerSeries_abstract
 from sage.structure.element import AlgebraElement
diff --git a/psage/modform/hilbert/sqrt5/hmf.py b/psage/modform/hilbert/sqrt5/hmf.py
index 83b565e8..8a02d88f 100644
--- a/psage/modform/hilbert/sqrt5/hmf.py
+++ b/psage/modform/hilbert/sqrt5/hmf.py
@@ -26,8 +26,8 @@
 from __future__ import absolute_import
 from __future__ import division
 
-from builtins import str
-from builtins import object
+
+
 from sage.misc.cachefunc import cached_method
 
 from .sqrt5 import F, O_F
diff --git a/psage/modform/hilbert/sqrt5/sqrt5.py b/psage/modform/hilbert/sqrt5/sqrt5.py
index c7dce2f5..565bf20f 100644
--- a/psage/modform/hilbert/sqrt5/sqrt5.py
+++ b/psage/modform/hilbert/sqrt5/sqrt5.py
@@ -104,8 +104,8 @@
 from __future__ import division
 
 
-from builtins import range
-from builtins import object
+
+
 from sage.all import NumberField, polygen, QQ, ZZ, QuaternionAlgebra, cached_function, disk_cached_function
 
 x = polygen(QQ,'x')
diff --git a/psage/modform/hilbert/sqrt5/tables.py b/psage/modform/hilbert/sqrt5/tables.py
index e28720de..44c2b199 100644
--- a/psage/modform/hilbert/sqrt5/tables.py
+++ b/psage/modform/hilbert/sqrt5/tables.py
@@ -1,8 +1,8 @@
 from __future__ import print_function
 from __future__ import absolute_import
 #import sqrt5_fast
-from builtins import str
-from builtins import range
+
+
 from . import sqrt5
 from sage.misc.all import cputime
 from sage.rings.all import Integer, ZZ
diff --git a/psage/modform/hilbert/sqrt5/tests.py b/psage/modform/hilbert/sqrt5/tests.py
index af5cc64b..ca33cc55 100644
--- a/psage/modform/hilbert/sqrt5/tests.py
+++ b/psage/modform/hilbert/sqrt5/tests.py
@@ -21,8 +21,8 @@
 #
 #################################################################################
 
-from builtins import str
-from builtins import range
+
+
 _multiprocess_can_split_ = True
 
 import random
diff --git a/psage/modform/jacobi/module.py b/psage/modform/jacobi/module.py
index afd0935f..96666b1b 100644
--- a/psage/modform/jacobi/module.py
+++ b/psage/modform/jacobi/module.py
@@ -27,7 +27,7 @@
 
 # python imports
 
-from builtins import map
+
 from sage.modular.arithgroup.congroup_sl2z import *
 from sage.all import Integer, ModularFormsRing, CommutativeRing, Infinity, SageObject, Parent, IntegerRing, EisensteinForms
 from psage.modform.jacobi.space import *
diff --git a/psage/modform/jacobiforms/jacobiformd1nn_fegenerators.py b/psage/modform/jacobiforms/jacobiformd1nn_fegenerators.py
index ee2e7c83..2d9fa769 100644
--- a/psage/modform/jacobiforms/jacobiformd1nn_fegenerators.py
+++ b/psage/modform/jacobiforms/jacobiformd1nn_fegenerators.py
@@ -22,9 +22,9 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
-from builtins import object
+
+
+
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_lazyelement import \
                                         EquivariantMonoidPowerSeries_lazy
 from psage.modform.jacobiforms.jacobiformd1nn_fourierexpansion import JacobiD1NNFourierExpansionModule
diff --git a/psage/modform/jacobiforms/jacobiformd1nn_fegenerators_modular.py b/psage/modform/jacobiforms/jacobiformd1nn_fegenerators_modular.py
index 5c33763f..5afb4eac 100644
--- a/psage/modform/jacobiforms/jacobiformd1nn_fegenerators_modular.py
+++ b/psage/modform/jacobiforms/jacobiformd1nn_fegenerators_modular.py
@@ -21,8 +21,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
+
+
 from sage.misc.all import prod
 from sage.rings.all import PowerSeriesRing, GF
 from sage.rings.all import binomial, factorial
diff --git a/psage/modform/jacobiforms/jacobiformd1nn_fourierexpansion.py b/psage/modform/jacobiforms/jacobiformd1nn_fourierexpansion.py
index 80bfcfd6..3150df36 100644
--- a/psage/modform/jacobiforms/jacobiformd1nn_fourierexpansion.py
+++ b/psage/modform/jacobiforms/jacobiformd1nn_fourierexpansion.py
@@ -29,8 +29,8 @@
 ## even weight
 ## c(n, r) = c(n', r') <=> r' \equiv \pm r (2m) and r'**2 - 4 n' m = r**2 - 4 n m
 
-from builtins import map
-from builtins import range
+
+
 from operator import xor
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids import TrivialCharacterMonoid,\
     TrivialRepresentation
diff --git a/psage/modform/jacobiforms/jacobiformd1nn_types.py b/psage/modform/jacobiforms/jacobiformd1nn_types.py
index e0642066..7a874000 100644
--- a/psage/modform/jacobiforms/jacobiformd1nn_types.py
+++ b/psage/modform/jacobiforms/jacobiformd1nn_types.py
@@ -25,8 +25,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
+
+
 from operator import xor
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_grading import TrivialGrading
 from psage.modform.fourier_expansion_framework.modularforms.modularform_ambient import ModularFormsModule_generic
diff --git a/psage/modform/maass/automorphic_forms.py b/psage/modform/maass/automorphic_forms.py
index 09d0977a..a87ca805 100644
--- a/psage/modform/maass/automorphic_forms.py
+++ b/psage/modform/maass/automorphic_forms.py
@@ -153,8 +153,8 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from builtins import str
-from builtins import range
+
+
 import mpmath
 from sage.all import SageObject,Parent,ln,latex,random,divisors,ModularForms,prime_divisors,real,imag,PowerSeriesRing,\
     PolynomialRing,CyclotomicField,dimension_cusp_forms,dimension_modular_forms,CuspForms,ZZ,RealField,DirichletGroup,\
diff --git a/psage/modform/maass/find_maass_forms.py b/psage/modform/maass/find_maass_forms.py
index f03501ce..a46e8a9f 100644
--- a/psage/modform/maass/find_maass_forms.py
+++ b/psage/modform/maass/find_maass_forms.py
@@ -6,9 +6,9 @@
 from __future__ import print_function
 from __future__ import division
 
-from builtins import str
-from builtins import map
-from builtins import range
+
+
+
 import logging
 
 from sage.all import RealField,RR,gcd,QQ,sqrt,log,ceil
diff --git a/psage/modform/maass/harmonic_test.py b/psage/modform/maass/harmonic_test.py
index 73a56d2d..e366645f 100644
--- a/psage/modform/maass/harmonic_test.py
+++ b/psage/modform/maass/harmonic_test.py
@@ -2,7 +2,7 @@
 Python routines for calculating Harmonic Weak Maass forms
 """
 from __future__ import print_function, division
-from builtins import range
+
 from sage.all import *
 from sage.all import MPComplexField,RealField, MatrixSpace,RR,ceil,log,sqrt,exp,gamma
 from psage import *
diff --git a/psage/modform/maass/maass_forms.py b/psage/modform/maass/maass_forms.py
index 75894b18..d1cc9c6c 100644
--- a/psage/modform/maass/maass_forms.py
+++ b/psage/modform/maass/maass_forms.py
@@ -18,9 +18,9 @@
 from __future__ import print_function
 from __future__ import absolute_import
 from __future__ import division
-from builtins import str
-from builtins import map
-from builtins import range
+
+
+
 import mpmath as mpmath
 from sage.functions.all import ln,sqrt,floor
 from sage.arith.all import divisors,gcd,inverse_mod
diff --git a/psage/modform/maass/multiplier_systems.py b/psage/modform/maass/multiplier_systems.py
index fbe4546f..42963dce 100644
--- a/psage/modform/maass/multiplier_systems.py
+++ b/psage/modform/maass/multiplier_systems.py
@@ -35,8 +35,8 @@
 from __future__ import print_function
 from __future__ import division
 
-from builtins import str
-from builtins import range
+
+
 from sage.all import SageObject,CyclotomicField,Integer,is_even,ZZ,QQ,Rational,kronecker,is_odd,SL2Z,Gamma0,matrix,floor,ceil,lcm,copy,trivial_character,var,DirichletGroup
 from sage.all import kronecker_character,kronecker_character_upside_down,I
 from sage.misc.cachefunc import cached_function,cached_method
diff --git a/psage/modform/maass/poincare_series.py b/psage/modform/maass/poincare_series.py
index 8540f101..ca4de112 100644
--- a/psage/modform/maass/poincare_series.py
+++ b/psage/modform/maass/poincare_series.py
@@ -7,7 +7,7 @@
 from __future__ import absolute_import
 from __future__ import division
 
-from builtins import range
+
 from sage.all import ComplexField,inverse_mod,CyclotomicField,SageObject,Integer,RealField,gcd,factorial
 from .multiplier_systems import *
 from psage.modform.arithgroup.mysubgroup import *
diff --git a/psage/modform/maass/poincare_series_vv.py b/psage/modform/maass/poincare_series_vv.py
index c37dd4f5..09c28413 100755
--- a/psage/modform/maass/poincare_series_vv.py
+++ b/psage/modform/maass/poincare_series_vv.py
@@ -36,8 +36,8 @@
 #                  https://www.gnu.org/licenses/
 # ****************************************************************************
 
-from builtins import str
-from builtins import range
+
+
 import re
 import os
 p= re.compile('MatrixSpace')
diff --git a/psage/modform/maass/vv_harmonic_weak_maass_forms.py b/psage/modform/maass/vv_harmonic_weak_maass_forms.py
index f3346e03..8ace5ac1 100644
--- a/psage/modform/maass/vv_harmonic_weak_maass_forms.py
+++ b/psage/modform/maass/vv_harmonic_weak_maass_forms.py
@@ -48,9 +48,9 @@
 from __future__ import absolute_import
 from __future__ import division
 
-from builtins import map
-from builtins import str
-from builtins import range
+
+
+
 import mpmath as mpmath
 # ugly fix to support pickling of mpmath matrices
 import mpmath.matrices.matrices
diff --git a/psage/modform/maass/weil_rep_simple.py b/psage/modform/maass/weil_rep_simple.py
index 39183f13..8e492099 100644
--- a/psage/modform/maass/weil_rep_simple.py
+++ b/psage/modform/maass/weil_rep_simple.py
@@ -22,8 +22,8 @@
 from __future__ import print_function
 from __future__ import division
 
-from builtins import str
-from builtins import range
+
+
 
 from psage.modules.weil_module import WeilModule
 from sage.all import Parent,QQ,ZZ,Integer,SL2Z,CyclotomicField,lcm,odd_part,kronecker,gcd,IntegerModRing,matrix,is_odd,\
diff --git a/psage/modform/paramodularforms/paramodularformd2_element.py b/psage/modform/paramodularforms/paramodularformd2_element.py
index 33efe26c..f13f9980 100644
--- a/psage/modform/paramodularforms/paramodularformd2_element.py
+++ b/psage/modform/paramodularforms/paramodularformd2_element.py
@@ -26,8 +26,8 @@
 #
 #===============================================================================
 
-from builtins import range
-from builtins import object
+
+
 from psage.modform.fourier_expansion_framework.modularforms.modularform_element import ModularForm_generic
 from psage.modform.paramodularforms.paramodularformd2_fourierexpansion import ParamodularFormD2Filter_trace
 from psage.modform.paramodularforms.paramodularformd2_fourierexpansion_cython import apply_GL_to_form
diff --git a/psage/modform/paramodularforms/paramodularformd2_fegenerators.py b/psage/modform/paramodularforms/paramodularformd2_fegenerators.py
index 8370d14e..ff483d74 100644
--- a/psage/modform/paramodularforms/paramodularformd2_fegenerators.py
+++ b/psage/modform/paramodularforms/paramodularformd2_fegenerators.py
@@ -27,7 +27,7 @@
 #
 #===============================================================================
 
-from builtins import range
+
 from psage.modform.jacobiforms.jacobiformd1nn_fegenerators import JacobiFormD1NNFactory
 from psage.modform.jacobiforms.jacobiformd1nn_types import JacobiFormsD1NN,\
     JacobiFormD1NN_Gamma
diff --git a/psage/modform/paramodularforms/paramodularformd2_fourierexpansion.py b/psage/modform/paramodularforms/paramodularformd2_fourierexpansion.py
index 32f58df8..cc72074c 100644
--- a/psage/modform/paramodularforms/paramodularformd2_fourierexpansion.py
+++ b/psage/modform/paramodularforms/paramodularformd2_fourierexpansion.py
@@ -26,8 +26,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
+
+
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids import TrivialCharacterMonoid, \
                                            TrivialRepresentation
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ring import EquivariantMonoidPowerSeriesRing
diff --git a/psage/modform/paramodularforms/paramodularformd2_types.py b/psage/modform/paramodularforms/paramodularformd2_types.py
index d82552f8..07ac5e1d 100644
--- a/psage/modform/paramodularforms/paramodularformd2_types.py
+++ b/psage/modform/paramodularforms/paramodularformd2_types.py
@@ -25,8 +25,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
+
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.expansion_module import ExpansionModule
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_grading import TrivialGrading
 from psage.modform.fourier_expansion_framework.modularforms.modularform_ambient import ModularFormsModule_generic
diff --git a/psage/modform/paramodularforms/siegelmodularformg2_element.py b/psage/modform/paramodularforms/siegelmodularformg2_element.py
index 83bb2eb8..bc4106ad 100644
--- a/psage/modform/paramodularforms/siegelmodularformg2_element.py
+++ b/psage/modform/paramodularforms/siegelmodularformg2_element.py
@@ -25,8 +25,8 @@
 #
 #===============================================================================
 
-from builtins import range
-from builtins import object
+
+
 from psage.modform.fourier_expansion_framework.modularforms.modularform_element import ModularForm_generic, \
                                              ModularFormVector_generic
 
diff --git a/psage/modform/paramodularforms/siegelmodularformg2_fegenerators.py b/psage/modform/paramodularforms/siegelmodularformg2_fegenerators.py
index 8825ccd6..5c788073 100644
--- a/psage/modform/paramodularforms/siegelmodularformg2_fegenerators.py
+++ b/psage/modform/paramodularforms/siegelmodularformg2_fegenerators.py
@@ -38,8 +38,8 @@
 #
 #===============================================================================
 
-from builtins import range
-from builtins import object
+
+
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_lazyelement import EquivariantMonoidPowerSeries_lazy
 from psage.modform.paramodularforms.siegelmodularformg2_fourierexpansion import SiegelModularFormG2FourierExpansionRing
 from sage.combinat.partition import number_of_partitions
diff --git a/psage/modform/paramodularforms/siegelmodularformg2_fourierexpansion.py b/psage/modform/paramodularforms/siegelmodularformg2_fourierexpansion.py
index c7a49075..cf3751bc 100644
--- a/psage/modform/paramodularforms/siegelmodularformg2_fourierexpansion.py
+++ b/psage/modform/paramodularforms/siegelmodularformg2_fourierexpansion.py
@@ -26,8 +26,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
+
+
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids import TrivialCharacterMonoid, \
                                            TrivialRepresentation
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ring import EquivariantMonoidPowerSeriesRing
diff --git a/psage/modform/paramodularforms/siegelmodularformg2_maassproducts.py b/psage/modform/paramodularforms/siegelmodularformg2_maassproducts.py
index c8c977d2..fb019db0 100644
--- a/psage/modform/paramodularforms/siegelmodularformg2_maassproducts.py
+++ b/psage/modform/paramodularforms/siegelmodularformg2_maassproducts.py
@@ -27,8 +27,8 @@
 #===============================================================================
 
 from builtins import zip
-from builtins import map
-from builtins import range
+
+
 from sage.matrix.constructor import matrix
 from sage.misc.all import prod
 from sage.arith.all import random_prime
diff --git a/psage/modform/paramodularforms/siegelmodularformg2_submodule.py b/psage/modform/paramodularforms/siegelmodularformg2_submodule.py
index bfccb4f1..5eb1ea40 100644
--- a/psage/modform/paramodularforms/siegelmodularformg2_submodule.py
+++ b/psage/modform/paramodularforms/siegelmodularformg2_submodule.py
@@ -25,9 +25,9 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
-from builtins import object
+
+
+
 from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_submodule import GradedExpansionSubmoduleVector_generic
 from psage.modform.fourier_expansion_framework.modularforms.modularform_submodule import ModularFormsSubmodule_singleweight_ambient_pid, \
                                                ModularFormsSubmodule_heckeinvariant_submodule
diff --git a/psage/modform/paramodularforms/siegelmodularformg2vv_fegenerators.py b/psage/modform/paramodularforms/siegelmodularformg2vv_fegenerators.py
index a874952f..de3e69fe 100644
--- a/psage/modform/paramodularforms/siegelmodularformg2vv_fegenerators.py
+++ b/psage/modform/paramodularforms/siegelmodularformg2vv_fegenerators.py
@@ -26,7 +26,7 @@
 #
 #===============================================================================
 
-from builtins import object
+
 from psage.modform.paramodularforms.siegelmodularformg2_fourierexpansion import SiegelModularFormG2VVFourierExpansionRing
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ambient import EquivariantMonoidPowerSeriesAmbient_abstract
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_lazyelement import EquivariantMonoidPowerSeries_lazy
diff --git a/psage/modform/paramodularforms/siegelmodularformg4_fourierexpansion.py b/psage/modform/paramodularforms/siegelmodularformg4_fourierexpansion.py
index 916c872a..b8844e04 100644
--- a/psage/modform/paramodularforms/siegelmodularformg4_fourierexpansion.py
+++ b/psage/modform/paramodularforms/siegelmodularformg4_fourierexpansion.py
@@ -24,8 +24,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
+
+
 from copy import copy
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids \
               import TrivialCharacterMonoid, TrivialRepresentation
diff --git a/psage/modform/paramodularforms/siegelmodularformgn_fegenerators.py b/psage/modform/paramodularforms/siegelmodularformgn_fegenerators.py
index eb411ad3..5b23d154 100644
--- a/psage/modform/paramodularforms/siegelmodularformgn_fegenerators.py
+++ b/psage/modform/paramodularforms/siegelmodularformgn_fegenerators.py
@@ -27,7 +27,7 @@
 #===============================================================================
 
 from builtins import filter
-from builtins import range
+
 from sage.matrix.constructor import diagonal_matrix
 from sage.matrix.constructor import matrix
 from sage.misc.cachefunc import cached_method
diff --git a/psage/modform/paramodularforms/siegelmodularformgn_fourierexpansion.py b/psage/modform/paramodularforms/siegelmodularformgn_fourierexpansion.py
index ae0001e9..c9e55d64 100644
--- a/psage/modform/paramodularforms/siegelmodularformgn_fourierexpansion.py
+++ b/psage/modform/paramodularforms/siegelmodularformgn_fourierexpansion.py
@@ -26,8 +26,8 @@
 #
 #===============================================================================
 
-from builtins import map
-from builtins import range
+
+
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids \
               import TrivialCharacterMonoid, TrivialRepresentation
 from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ring \
diff --git a/psage/modform/periods/period_polynomials.py b/psage/modform/periods/period_polynomials.py
index dce14356..53b9e77c 100644
--- a/psage/modform/periods/period_polynomials.py
+++ b/psage/modform/periods/period_polynomials.py
@@ -7,8 +7,8 @@
 from __future__ import absolute_import
 from __future__ import division
 
-from builtins import map
-from builtins import range
+
+
 from sage.all import SL2Z,SageObject,is_squarefree,RealField,ComplexField,Matrix,conjugate,binomial,Gamma0,is_prime,ZZ,Cusp,gcd,ceil,floor,log,CyclotomicField,divisors
 
 
diff --git a/psage/modform/rational/padic_lseries.py b/psage/modform/rational/padic_lseries.py
index 10cbb288..d9ff072c 100644
--- a/psage/modform/rational/padic_lseries.py
+++ b/psage/modform/rational/padic_lseries.py
@@ -35,7 +35,7 @@
 ######################################################################
 
 
-from builtins import range
+
 from sage.rings.integer_ring import ZZ
 from sage.rings.rational_field import QQ
 from sage.rings.padics.factory import Qp, Zp
diff --git a/psage/modform/rational/special.py b/psage/modform/rational/special.py
index 062ec1f6..f9f69c74 100644
--- a/psage/modform/rational/special.py
+++ b/psage/modform/rational/special.py
@@ -26,8 +26,8 @@
 from __future__ import print_function
 
 from builtins import zip
-from builtins import range
-from builtins import object
+
+
 import sys
 from sage.rings.all import ZZ, QQ, PolynomialRing
 from sage.modular.all import eisenstein_series_qexp, ModularForms
diff --git a/psage/modform/siegel/pushout.py b/psage/modform/siegel/pushout.py
index 43849962..069abf10 100644
--- a/psage/modform/siegel/pushout.py
+++ b/psage/modform/siegel/pushout.py
@@ -1,6 +1,6 @@
 from __future__ import print_function
-from builtins import str
-from builtins import range
+
+
 from sage.categories.functor import Functor
 from sage.categories.basic import *
 
diff --git a/psage/modform/siegel/siegel_modular_form.py b/psage/modform/siegel/siegel_modular_form.py
index 0e72a4c2..a40715b3 100644
--- a/psage/modform/siegel/siegel_modular_form.py
+++ b/psage/modform/siegel/siegel_modular_form.py
@@ -46,8 +46,8 @@
 #                  https://www.gnu.org/licenses/
 # ****************************************************************************
 from __future__ import absolute_import, division
-from builtins import str
-from builtins import range
+
+
 try:
     import cPickle as pickle
 except ImportError:
diff --git a/psage/modform/siegel/siegel_modular_form_prec.py b/psage/modform/siegel/siegel_modular_form_prec.py
index 475d7393..36d1d0f5 100644
--- a/psage/modform/siegel/siegel_modular_form_prec.py
+++ b/psage/modform/siegel/siegel_modular_form_prec.py
@@ -5,8 +5,8 @@
 from __future__ import division
 
 
-from builtins import str
-from builtins import range
+
+
 from copy import deepcopy
 import operator
 
diff --git a/psage/modform/siegel/siegel_modular_forms_algebra.py b/psage/modform/siegel/siegel_modular_forms_algebra.py
index daaf1c67..5fb6ed9e 100644
--- a/psage/modform/siegel/siegel_modular_forms_algebra.py
+++ b/psage/modform/siegel/siegel_modular_forms_algebra.py
@@ -1,5 +1,5 @@
 from __future__ import absolute_import
-from builtins import str
+
 from .siegel_modular_form import SiegelModularForm, SiegelModularForm_class, SMF_DEFAULT_PREC
 from sage.algebras.algebra import Algebra
 from sage.misc.all import cached_method
diff --git a/psage/modform/weilrep_tools/dimension.py b/psage/modform/weilrep_tools/dimension.py
index c156a8e0..38e7854a 100644
--- a/psage/modform/weilrep_tools/dimension.py
+++ b/psage/modform/weilrep_tools/dimension.py
@@ -21,7 +21,7 @@
 #*****************************************************************************
 
 #from psage.modules import *
-from builtins import range
+
 from sage.all import SageObject, Integer, RR, is_odd, next_prime, floor, \
                      RealField, ZZ, ceil, log, ComplexField, real, sqrt, exp, round, prime_range, dimension_cusp_forms, \
                      kronecker_character, Matrix, QQ
diff --git a/psage/modform/weilrep_tools/test_global.py b/psage/modform/weilrep_tools/test_global.py
index 0524fbb8..ff88d488 100644
--- a/psage/modform/weilrep_tools/test_global.py
+++ b/psage/modform/weilrep_tools/test_global.py
@@ -1,7 +1,7 @@
 from __future__ import print_function
 from __future__ import division
-from builtins import str
-from builtins import range
+
+
 from sage.quadratic_forms.genera.genus import GenusSymbol_global_ring, Genus_Symbol_p_adic_ring, is_GlobalGenus
 from psage.modules.finite_quadratic_module import FiniteQuadraticModule
 from sage.matrix.matrix_space import MatrixSpace
diff --git a/psage/modform/weilrep_tools/weight_one_half.py b/psage/modform/weilrep_tools/weight_one_half.py
index c781fb01..3c6a8ea9 100644
--- a/psage/modform/weilrep_tools/weight_one_half.py
+++ b/psage/modform/weilrep_tools/weight_one_half.py
@@ -1,6 +1,6 @@
 from __future__ import print_function
 from __future__ import division
-from builtins import range
+
 from sage.all import SageObject, Integer, RR, is_odd, next_prime, floor, RealField, ZZ, ceil, log, ComplexField, real, sqrt, exp, is_squarefree, lcm, Matrix, cached_function
 from psage.modules.finite_quadratic_module import FiniteQuadraticModule
 from psage.modules.weil_invariants import invariants
diff --git a/psage/modules/finite_quadratic_module.py b/psage/modules/finite_quadratic_module.py
index 40910ead..d52fab1b 100644
--- a/psage/modules/finite_quadratic_module.py
+++ b/psage/modules/finite_quadratic_module.py
@@ -88,9 +88,9 @@
 from __future__ import print_function
 from __future__ import division
 
-from builtins import map
-from builtins import str
-from builtins import range
+
+
+
 from sage.functions.other                 import floor
 from sage.arith.all                       import divisors, is_prime, kronecker, lcm, gcd, prime_divisors, primitive_root, is_square, is_prime_power, inverse_mod, binomial
 from sage.rings.all                       import ZZ, QQ, Integer, PolynomialRing,CC
diff --git a/psage/modules/weil_module.py b/psage/modules/weil_module.py
index b54f0f90..1aa25911 100644
--- a/psage/modules/weil_module.py
+++ b/psage/modules/weil_module.py
@@ -44,7 +44,7 @@
 
 #from sage.all_cmdline import *   # import sage library
 
-from builtins import range
+
 from sage.all import Integer,RR,CC,QQ,ZZ,sgn,cached_method,copy,CyclotomicField,lcm,is_square,matrix,SL2Z,MatrixSpace,\
     floor,ceil,is_odd,is_even,hilbert_symbol,sqrt,inverse_mod,xgcd,latex,kronecker,gcd,divisors,odd_part,gcd,valuation,\
     vector
diff --git a/psage/rh/low_zeros.py b/psage/rh/low_zeros.py
index e333379d..9cbfbf95 100644
--- a/psage/rh/low_zeros.py
+++ b/psage/rh/low_zeros.py
@@ -22,8 +22,8 @@
 """
 We study low zeros.
 """
-from builtins import range
-from builtins import object
+
+
 from sage.all import is_fundamental_discriminant, ZZ, parallel, var, sgn, fundamental_discriminant, kronecker_character,\
                        log,find_root
 import os
diff --git a/psage/rh/mazur_stein/book.py b/psage/rh/mazur_stein/book.py
index fe177b4e..5c9fdcbe 100644
--- a/psage/rh/mazur_stein/book.py
+++ b/psage/rh/mazur_stein/book.py
@@ -25,9 +25,9 @@
 """
 from __future__ import print_function, division
 
-from builtins import str
-from builtins import range
-from builtins import object
+
+
+
 import math
 import os
 import sys
diff --git a/psage/rh/mazur_stein/game2.py b/psage/rh/mazur_stein/game2.py
index dcc930d1..fc555720 100644
--- a/psage/rh/mazur_stein/game2.py
+++ b/psage/rh/mazur_stein/game2.py
@@ -1,5 +1,5 @@
 from __future__ import division
-from builtins import object
+
 from sage.all import prime_range, I
 
 class J_E(object):
diff --git a/psage/zfunctions/selberg_z.py b/psage/zfunctions/selberg_z.py
index b436dc37..e7fbf2d7 100644
--- a/psage/zfunctions/selberg_z.py
+++ b/psage/zfunctions/selberg_z.py
@@ -41,8 +41,8 @@
 #*****************************************************************************
 
 
-from builtins import map
-from builtins import range
+
+
 import mpmath as mpmath
 from sage.all import  Parent,RR,ZZ,QQ,is_even,matrix,zeta,is_odd,is_even,ceil,log,gamma,tan,cos,sin,latex,\
     CyclotomicField,MatrixSpace,sign,binomial,RealField,exp,Rational, arg