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  • Decorator

    A Python decorator is a specific change to the Python syntax that allows us to more conveniently alter functions and methods (and possibly classes in a future version). This supports more readable applications of the DecoratorPattern but also other uses as well.

    Decorator修饰符,可以方便地对函数和类进行_修饰_。

    Function decorators

    def decorator_function(original_function):
    	def wrapper_function(*args, **kwargs):
    		print('Wrapper executed this before!')
    		return original_function(*args, **kwargs)
    	return wrapper_function
    
    @decorator_function # display = decorator_function(display)
    def display():
    	print('display function ran')
    
    @decorator_function
    def display_info(name, age):
    	print('display_info ran with arguments ({}, {})'.format(name, age))
    
    # display_info('John', 25)
    # display()
    

    Class decorators

    class decorator_class(object):
    	def __init__(self, original_function):
    		self.original_function = original_function
    
    	def __call__(self, *args, **kwargs):
    		print('Call method executed this before!')
    		return self.original_function(*args, **kwargs)
    
    @decorator_class # display = decorator_function(display)
    def display():
    	print('display function ran')
    
    @decorator_class
    def display_info(name, age):
    	print('display_info ran with arguments ({}, {})'.format(name, age))
    
    display_info('John', 25)
    display()
    
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  • 原文地址:https://www.cnblogs.com/yaos/p/7053452.html
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