Deprecation warnings are raised due to invalid escape sequences in Python 3.8 . Below is a log of the warnings raised during compiling all the python files. Using raw strings or escaping them will fix this issue.

find . -iname '*.py'  | xargs -P 4 -I{} python -Wall -m py_compile {}

./humpty.py:252: DeprecationWarning: invalid escape sequence \s
  """Compute egg metadata from PEP427 Wheel 1.0 metadata.