parameters: (self, key)
return_statement: return key in self.data
docstring: Returns True if key is set.
docstring_summary: Returns True if key is set.
docstring_tokens: Returns True if key is set .
function: def has_key(self, key):
          """Returns True if key is set."""
          self.ensure_data_loaded()
          return key in self.data
function_tokens: def has_key ( self , key ) : self . ensure_data_loaded ( ) return key in self . data