Deprecation warnings are raised due to invalid escape sequences. This can be fixed by using raw strings or escaping the literals. pyupgrade also helps in automatic conversion : https://github.com/asottile/pyupgrade/

python -Wall -m py_compile describe.py
describe.py:203: DeprecationWarning: invalid escape sequence \s
  m = re.search('^\s+([a-zA-Z0-9_]+): (.*)', line)