code: def deprecated(function):  # pylint: disable=invalid-name
    
  
    def IssueDeprecationWarning(*args, **kwargs):
      """Issue a deprecation warning."""
      warnings.simplefilter('default', DeprecationWarning)
      warnings.warn('Call to deprecated function: {0:s}.'.format(
          function.__name__), category=DeprecationWarning, stacklevel=2)
  
      return function(*args, **kwargs)
  
    IssueDeprecationWarning.__name__ = function.__name__
    IssueDeprecationWarning.__doc__ = function.__doc__
    IssueDeprecationWarning.__dict__.update(function.__dict__)
    return IssueDeprecationWarning
docs: Decorator to mark functions or methods as deprecated.