Pythonでメソッドチェーンを実装する - Qiitaclass MyList(list): ... def method(defined_type): def wrap(f): def wrapper(*args, **kwargs): return defined_type(f(*args, **kwargs)) return wrapper def decorator(f): setattr(defined_type, f.__name__, wrap(f)) return decorator @method(MyList) def map(l, func): return [func(el) for el in l] print(MyList([1, 2, 3]).map(lambda x: x+1).map(lambda x: x+2)) # [4, 5, 6]
