def extend_with ( func ) : if not func . __name__ in ArgParseInator . _plugins : ArgParseInator . _plugins [ func . __name__ ] = func
python how to add builtin
Extends with class or function
def extend_with(func):
    """Extends with class or function"""
    if not func.__name__ in ArgParseInator._plugins:
        ArgParseInator._plugins[func.__name__] = func