code: def _param_deprecation_warning(schema, deprecated, context):
      
      for i in deprecated:
          if i in schema:
                  msg = 'When matching {ctx}, parameter {word} is deprecated, use __{word}__ instead'
                  msg = msg.format(ctx = context, word = i)
                  warnings.warn(msg, Warning)
docs: Raises warning about using the 'old' names for some parameters.
  
      The new naming scheme just has two underscores on each end of the word for consistency