parameters: (self, key)
return_statement: return key in self.keys()
docstring: Returns True if the property contains key.
docstring_summary: Returns True if the property contains key.
docstring_tokens: Returns True if the property contains key .
function: def __contains__(self, key):
          """Returns True if the property contains key."""
          return key in self.keys()
function_tokens: def __contains__ ( self , key ) : return key in self . keys ( )