Syntax warnings due to comparison of literals using is

[tirkarthi]

find . -iname '*.py' | grep -v example | xargs -P4 -I{} python3.8 -Wall -m py_compile {}
./tests/tests.py:266: SyntaxWarning: "is" with a literal. Did you mean "=="?
  self.jpg.optional_image.field.storage.size(