Upgrade sympy #2
Description
We are currently stuck on sympy version 1.1.1 and need to make some effort into upgrading to a newer version.
When running the tests we currently see this warning
venv/lib/python3.8/site-packages/sympy/core/basic.py:3
/Users/henriknf/local/src/modelparameters/venv/lib/python3.8/site-packages/sympy/core/basic.py:3: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.9 it will stop working
from collections import Mapping, defaultdict
venv/lib/python3.8/site-packages/sympy/plotting/plot.py:28
/Users/henriknf/local/src/modelparameters/venv/lib/python3.8/site-packages/sympy/plotting/plot.py:28: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.9 it will stop working
from collections import Callable
In other words, we will not be able to use python3.9 before we upgrade sympy.