code: def get_identifiers(source_code):
      '''Split source code into python identifier-like tokens'''
      tokens = set(re.split(r"[^0-9a-zA-Z_.]", source_code))
      valid = re.compile(r'[a-zA-Z_]')
      return [token for token in tokens if re.match(valid, token)f get_identifiers(source_code):
      '''Split source code into python identifier-like tokens'''
      tokens = set(re.split(r"[^0-9a-zA-Z_.]", source_code))
      valid = re.compile(r'[a-zA-Z_]')
      return [token for token in tokens if re.match(valid, token)]
docs: Split source code into python identifier-like tokens