python Python的装饰器示例代码

Posted 2021-05-09

# coding: utf-8
"""

"""
def deco(func):
    def in_deco(x, y):
        print ('in deco')
        func(x, y)
    print ('cal deco')
    return in_deco

# deco(bar) -> in_deco
# bar = in_deco
# bar() in_deco()

@deco
def bar(x, y):
    print ('in bar', x + y)

print (type(bar))
bar(1, 2)

# 就像是env Python那样的美丽。
# coding: utf-8

'''
闭包的概念：
内部函数中对enclosing作用域的变量进行引用
'''

def func_150(val):
    passline = 90
    # 打印val的地址
    print ("Val id is %x" % id(val))

    passline = 90
    if val >= passline:
        print ('%d pass' % val)
    else:
        print ('failed')

def func_100(val):
    passline = 60
    # 打印val的地址
    print ("Val id is %x" % id(val))

    if val >= passline:
        print ('%d pass' % val)
    else:
        print ('failed')

    # def in_func(): #(val,) val会被添加进来
    #     print (val)
    # in_func()
    # return in_func


def Max(val1, val2):
    return max(val1, val2)

# f = func(89)
# f() # in_func
# print(Max(90, 100))
# print (f.__closure__)

func_150(89)
func_100(89)


print('-------------------------------')

# 有没有一种方式？

def set_passline(passline): # passline = 60
    # print ("%x" % id(passline)) 
    def cmp(val): # passline 添加到clojure属性中
        if val >= passline:
            print ('Pass')
        else:
            print ('Failed')
    return cmp

f_100 = set_passline(60)
print (type(f_100))
print (f_100.__closure__)
f_100(89)
# f_100(59)

f_150 = set_passline(90)
# print (type(f_150))
# print (f_150.__closure__)
f_150(89)

# 以上就是闭包的优越性
'''
1. 封装
2. 复用
'''