Python装饰器简单实例

#!/usr/bin/env python
__author__ = '氨蛋三键'


class Tracer:

    def __init__(self, fun):
        self.calls = 0
        self.fun = fun

    def __call__(self, *args, **kwargs):
        self.calls += 1
        print("Tracer 第 %s 次调用的函数是 %s " % (self.calls, self.fun.__name__))
        self.fun(*args, **kwargs)


class TestDemo:

    @Tracer
    def fun(*args, **kwargs):
        print(*args, **kwargs)

if __name__ == "__main__":
    td = TestDemo()
    td.fun(1, 2, 3, 4, 5, 6, 7)

执行结果是:

Tracer 第 1 次调用的函数是 fun 
1 2 3 4 5 6 7