作业-第十一天（python“三大神器之装饰器”）

1. 为函数写一个装饰器，在函数执行之后输出 after


def li(fn):
    def test(*args, **kwargs):
        re = fn(*args, **kwargs)
        print('after')
        return re

    return test


@li
def li_sum1(x, y):
    print(x + y)


li_sum1(10, 20)

# 结果
30
after

Process finished with exit code 0

2. 为函数写一个装饰器，把函数的返回值 +100 然后再返回。

def add_100(fn):
    def test(*args, **kwargs):
        re = fn(*args, **kwargs)
        return re + 100

    return test


@add_100
def li_sum1(x, y):
    return x + y


print(li_sum1(10, 20))

#结果
130

Process finished with exit code 0

3. 写一个装饰器@tag要求满足如下功能:

@tag
def render(text):
# 执行其他操作
return text

@tag
def render2():
return 'abc'

print(render('Hello')) # 打印出:

Hello

print(render2()) # 打印出:

abc

def tag(fn):
    def test(*args, **kwargs):
        re = fn(*args, *kwargs)
        return '' + re + ''

    return test


@tag
def render(x):
    return x


@tag
def render2():
    return 'abc'


print(render('hello'))
print(render2())

结果：

hello
abc

Process finished with exit code 0

4. 写一个装饰器@tag要求满足如下功能(需要使用带参的装饰器，自己先自学正在一下):

@tag(name='p')
def render(text):
# 执行其他操作
return text

@tag(name='div')
def render2():
return 'abc'