Python 装饰器小结

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2019/6/3 13:36
# @Author  : Ropon
# @File    : 12_02.py

# 装饰器

# def warpper(fn):
#     def inner():
#         print("装饰函数执行前")
#         fn() #利用闭包让函数常驻内存
#         print("装饰函数执行后")
#     return inner
#
# def test_func():
#     print("这是一个测试函数")
#
# test_func = warpper(test_func)
# test_func()

# 需要传入参数装饰器

# def warpper(fn):
#     def inner(*args, **kwargs):
#         print("装饰函数执行前")
#         fn(*args, **kwargs) #利用闭包让函数常驻内存
#         print("装饰函数执行后")
#     return inner
#
# def test_func(name, age):
#     print(f"这是一个测试函数, 姓名是:{name}, 年龄是:{age}")
#
# test_func = warpper(test_func)
# test_func("ropon", 18)

# 带返回值得装饰器

# def warpper(fn):
#     def inner(*args, **kwargs):
#         print("装饰函数执行前")
#         ret = fn(*args, **kwargs) #利用闭包让函数常驻内存
#         print("装饰函数执行后")
#         return ret
#     return inner
#
# def test_func(name, age):
#     print(f"这是一个测试函数, 姓名是:{name}, 年龄是:{age}")
#     return {"name": name, "age": age}
#
# test_func = warpper(test_func)
# res = test_func("ropon", 18)
# print(res)

# 带参数的装饰器

# def warpper_out(fn, flag):
#     def warpper(*args, **kwargs):
#         if flag:
#             print("装饰函数执行前")
#             ret = fn(*args, **kwargs)  # 利用闭包让函数常驻内存
#             print("装饰函数执行后")
#         else:
#             ret = fn(*args, **kwargs)  # 利用闭包让函数常驻内存
#         return ret
#     return warpper
#
# def test_func(name, age):
#     print(f"这是一个测试函数, 姓名是:{name}, 年龄是:{age}")
#     return {"name": name, "age": age}
#
# test_func = warpper_out(test_func, True)
# res = test_func("ropon", 18)
# print(res)

# 语法糖 @

# def warpper_out(flag):
#     def warpper(fn):
#         def inner(*args, **kwargs):
#             if flag:
#                 print("装饰函数执行前")
#                 ret = fn(*args, **kwargs) #利用闭包让函数常驻内存
#                 print("装饰函数执行后")
#             else:
#                 ret = fn(*args, **kwargs)  # 利用闭包让函数常驻内存
#             return ret
#         return inner
#     return warpper
#
# @warpper_out(False)
# def test_func(name, age):
#     print(f"这是一个测试函数, 姓名是:{name}, 年龄是:{age}")
#     return {"name": name, "age": age}
#
# res = test_func("ropon", 18)
# print(res)

# 多个装饰器

# def warpper_out1():
#     pass
#
# def warpper_out2():
#     pass
#
# def warpper_out3():
#     pass
#
#
# @warpper_out1
# @warpper_out2
# @warpper_out3
# def func():
#     pass

# 执行流程
#     warpper_out1
#         warpper_out2
#             warpper_out3
#             func
#             warpper_out3
#         warpper_out2
#     warpper_out1