Deprecation warning due to invalid escape sequences`

[tirkarthi]

./extra/update_comments_from_spec.py:13: DeprecationWarning: invalid escape sequence \s
  '(?P<methodsig>def\s+(?P<mname>[a-zA-Z0-9_]+)\(.*?\)'
./extra/update_comments_from_spec.py:14: DeprecationWarning: invalid escape sequence \s
  ':\n+\s+""")(?P<comment>.*?)(?=""")',
./extra/update_comments_from_spec.py:52: DeprecationWarning: invalid escape sequence \s
  regex = ('(?P<methodsig>def\s+' +
./extra/update_comments_from_spec.py:54: DeprecationWarning: invalid escape sequence \(
  '\(.*?\):\n+\s+""".*?\n).*?(?=""")')
./extra/update_comments_from_spec.py:56: DeprecationWarning: invalid escape sequence \g
  result = re.sub(regex, '\g<methodsig>' + new_comment, source, 0,