摘要:
class Typed: def __init__(self,key,expected_type): self.key=key self.expected_type=expected_type def __get__(self, instance, owner): print('get方法') # 阅读全文
摘要:
with obj as f: '代码块' 1.with obj 》触发obj.__enter__(),拿到返回值 2.as f >f=返回值、 3.with obj as f 等同于 f=obj.__enter__() 4.执行代码块一:没有异常的情况下,整个代码块运行完毕后去触发__exit__, 阅读全文