code: def _validate_python_version(s):
      "Return True if a string is of the form <int>.<int>, False otherwise."
      if not s:
          return True
      toks = s.split('.')
      if len(toks) != 2:
          return False
      try:
          int(toks[0])
          int(toks[1])
      except ValueError:
          return False
      return Truf _validate_python_version(s):
      "Return True if a string is of the form <int>.<int>, False otherwise."
      if not s:
          return True
      toks = s.split('.')
      if len(toks) != 2:
          return False
      try:
          int(toks[0])
          int(toks[1])
      except ValueError:
          return False
      return True
docs: Return True if a string is of the form <int>.<int>, False otherwise.