Test_decorator.py

# def tag(func):
#     def wrapper(text):
#         value = func(text)
#         return "p" + value + "p"
#     return wrapper
#
#
# def t(name):
#     def decorator(func):
#         def wrapper(text):
#             value = func(text)
#             return "<{name}>{value}</{name}>".format(name=name, value=value)
#         return wrapper
#     return decorator
#
# # @tag
# @t("abc")
# def my_upper(text):
#     value = text.upper()
#     return value
#
#
# def billion(func):
#     def convert(x):
#         y = func(x)
#         y = y.split('.')
#         y = y[0]
#         return y[:] # 100,000,000 - billion
#     return convert
#
# @billion
# def convert_num(x):
#     return x
#
# if __name__ == '__main__':
#     print(my_upper("hello"))
#     print(convert_num('123.456'))


'''''示例8: 装饰器带类参数'''

class locker:
    def __init__(self):
        print("locker.__init__() should be not called.")

    @staticmethod
    def acquire():
        print("locker.acquire() called.（这是静态方法）")

    @staticmethod
    def release():
        print("  locker.release() called.（不需要对象实例）")

def deco(cls):
    '''''cls 必须实现acquire和release静态方法'''
    def _deco(func):
        def __deco():
            print("before %s called [%s]." % (func.__name__, cls))
            cls.acquire()
            try:
                return func()
            finally:
                cls.release()
        return __deco
    return _deco

@deco(locker)
def myfunc():
    print(" myfunc() called.")

myfunc()
myfunc()