parameters: (self)
return_statement: return len(self._namemap)
docstring: Return the number of fields.
docstring_summary: Return the number of fields.
docstring_tokens: Return the number of fields .
function: def __len__(self):
          """
          Return the number of fields.
          """
          return len(self._namemap)
function_tokens: def __len__ ( self ) : return len ( self . _namemap )