simpleVersionDemo
'''
Description:
Version: 2.0
Author: xuchaoxin
Date: 2021-02-02 11:16:53
LastEditors: xuchaoxin
LastEditTime: 2021-02-02 11:58:11
'''
def log(func):
# print("executing the log()")
def wrapper(*args, **kw):
""" the wrapper function add some functions to the primitive function's invoke temporary/dynamically """
print("executing the wrapper()")
print('call %s():' % func.__name__)
return func(*args, **kw)
return wrapper # when you invoke the primitive function ,the decoration mechanism will invoke the wrapper after that
""" simple decoration """
def now():
print('hello now!')
#print("do a other thing")
now( )
With parameter
'''
Description:
Version: 2.0
Author: xuchaoxin
Date: 2021-02-02 10:05:09
LastEditors: xuchaoxin
LastEditTime: 2021-02-02 11:39:57
'''
import functools
# def log(func):
# #将原始函数func的_name_等属性复制到wrapper()函数中:
# @functools.wraps(func)
# def wrapper(*args, **kw):
# print('call %s():' % func.__name__)
# return func(*args, **kw)
# return wrapper
def log(text):
print("executing log() and to return/invoke decorator")
def decorator(func):
print("executing decorator and to return/invoke wrapper()")
# 将原始函数func的_name_等属性复制到wrapper()函数中:
.wraps(func)
def wrapper(*args, **kw):
print("executing wrapper() and to return/invoke func()(primitive function())")
print('\t use(print) the parameter of the decoration log():%s,\n\tprint the primitive funcition name: %s():' % (
text, func.__name__))
return func(*args, **kw)
return wrapper # 访问被装饰的函数(greet()的独立调用语句)
return decorator # 访问被装饰的函数的定义处(这里是def greet(),但并不直接执行greet()),然后回来
""" The decorator is called as a higher-order function """
("'test the parameter of the log() decoration'")
def greet():
print("executing the primitive function:greet()!!!")
print("hello")
""" if we don't invoke the function which is be decorated by the decoration function log(),it still could execute several statements of the log() decoration:
executing log() and to return/invoke decorator
executing decorator and to return/invoke wrapper()
"""
print("do another thing to observe the consistency of the decorator mechanism")
greet()
""" 调用greet()=>log("exec")=>decorator(func=greet)=>wrapper()=>func=greet() """
""" The decorator is called as a higher-order function """
#log("test invoke the log() decoration along")
