find . -iname '*.py' | xargs -P 4 -I{} python3.8 -Wall -m py_compile {}
./pygam/core.py:57: SyntaxWarning: "is not" with a literal. Did you mean "!="?
if flatten_attrs and k is not 'terms':
./pygam/pygam.py:225: SyntaxWarning: "is not" with a literal. Did you mean "!="?
if (self.terms is not 'auto') and not (isinstance(self.terms, (TermList, Term, type(None)))):
./pygam/pygam.py:276: SyntaxWarning: "is" with a literal. Did you mean "=="?
if self.terms is 'auto':