parameters: (self, key)
docstring: Initialize.
  
      Args:
        # key is any thing that could be in a list or a key in a dict
docstring_summary: Initialize.
docstring_tokens: Initialize .
function: def __init__(self, key):
      """Initialize.
  
      Args:
        # key is any thing that could be in a list or a key in a dict
      """
  
      self._key = key
function_tokens: def __init__ ( self , key ) : self . _key = key