docs: def validate_python_version(config, actual_py_version=None):
      # type: (Config, Optional[str]) -> None
      """Validate configuration matches a specific python version.
  
      If the ``actual_py_version`` is not provided, it will default
      to the major/minor version of the currently running python
      interpreter.
  
      :param actual_py_version: The major/minor python version in
          the form "pythonX.Y", e.g "python2.7", "python3.6".
  
      """
      lambda_version = config.lambda_python_version
      if actual_py_version is None:
          actual_py_version = 'python%s.%s' % sys.version_info[:2]
      if actual_py_version != lambda_version:
          # We're not making this a hard error for now, but we may
          # turn this into a hard fail.
          warnings.warn("You are currently running %s, but the closest "
                        "supported version on AWS Lambda is %s\n"
                        "Please use %s, otherwise you may run into "
                        "deployment issues. " %
                        (actual_py_version, lambda_version, lambda_version),
                        stacklevel=2)