diff --git a/pypfopt/base_optimizer.py b/pypfopt/base_optimizer.py
index f988409c..0678bdcb 100644
--- a/pypfopt/base_optimizer.py
+++ b/pypfopt/base_optimizer.py
@@ -8,11 +8,11 @@
 """
 
 import collections
+from collections.abc import Iterable
 import copy
 import json
-import warnings
-from collections.abc import Iterable
 from typing import List
+import warnings
 
 import cvxpy as cp
 import numpy as np
diff --git a/tests/test_discrete_allocation.py b/tests/test_discrete_allocation.py
index 3feca96d..f0953186 100644
--- a/tests/test_discrete_allocation.py
+++ b/tests/test_discrete_allocation.py
@@ -1,7 +1,7 @@
+from cvxpy.error import SolverError
 import numpy as np
 import pandas as pd
 import pytest
-from cvxpy.error import SolverError
 
 from pypfopt.discrete_allocation import DiscreteAllocation, get_latest_prices
 from tests.utilities_for_tests import get_data, setup_efficient_frontier