#闭包:参数和变量保存在内,返回函数本身;装饰器是函数的包装;
import functools        #保存原函数的签名
import time

def log(text):
    if isinstance(text,str):
        #text 是 str 需要多执行一层 decorator
        def decorator(func):
            @functools.wraps(func)
            def wrapper(*args,**kw):
                p(text)
                p('Action : %s()'%func.__name__)
                tmp = func(*args,**kw)
                p('Stop : %s()'%func.__name__)
                return tmp
            return wrapper
        return decorator
    else:
        #text不是str,就是function
        func = text
        @functools.wraps(func)
        def wrapper(*args,**kw):
            start_time = time.time()
            tmp = func(*args,**kw)
            end_time = time.time()
            p('No parameter，return Run-time：',end_time-start_time)
            return tmp
        return wrapper

@log
def function1() : 
    p(function1.__name__, 'is runing!')
    return 'return function1()'

@log('Have a parameter')
def function2() : 
    p(function2.__name__, 'is runing!')
    return 'return function2()'

p(function1())
p(function2())