闭包及装饰器

Posted 2021-03-20 python-beginner

#_*_coding:utf-8_*_
#作者：王佃元
#日期：2019/12/23

# 装饰器：decorator

# 闭包函数：函数块 + 定义函数时的环境。内部函数引用外层函数的变量


# def outer():
#     x = 10
#     # print(x, id(x))
#
#     def inner():
#         print(x, inner)
#     return inner
#
#
# f = outer()
# print(f)
# f()

# def show_time(f):
#     def inner():
#         start = time.time()
#         f()
#         end = time.time()
#         print(‘spend %s‘ % (end - start))
#     return inner


# @show_time
# def foo():
#     print(‘foo.......‘)
#     time.sleep(2)
#
#
# def bar():
#     print(‘bar.......‘)
#     time.sleep(3)
#
#
# foo = show_time(foo)
# foo()

import time


def log(flag=‘‘):
    def show_time(f):
        def inner(*a, **b):
            start = time.time()
            f(*a, **b)
            end = time.time()
            print(‘spend %s‘ % (end - start))
            if flag == ‘true‘:
                print(‘日志记录‘)
            else:
                print(‘错误信息‘)
        return inner
    return show_time


@log(‘true‘)        # foo = log(true)   show_time
def foo(*arg, **args):
    sum1 = 0
    for i in arg:
        sum1 += i
    print(sum1)
    time.sleep(2)


foo(1, 2, 4)


@log()
def bar():
    print(‘bar.......‘)
    time.sleep(3)