defdebug(func):
wrapper(*args, **kwargs): # 指定宇宙无敌参数
"[DEBUG]: enter {}()".format(func.__name__)
print 'Prepare and say...',
return func(*args, **kwargs)
return wrapper # 返回
@debug
defsay(something):
print "hello {}!".format(something)Python提供了可变参数*args和关键字参数**kwargs，有了这两个参数，装饰器就可以用于任意目标函数了。
我自己的例子
#!/usr/bin/env python
#todo use decorator to decorate the function that need debug and its function name
def debug(f):
def wrapper(*args,**kwargs):
print("this is the name of function: {0}".format(f.__name__))
if kwargs['username'] != 'admin':
raise Exception('you need to be admin')
f(*args,**kwargs) #装饰器内部函数的参数等于被修饰函数的参数
return wrapper@debug
def say_hi(sth,username): print("this is position args {0}".format(sth))
print("i am the master: {0}".format(username))
if __name__ == '__main__':
say_hi('first args',username='admin')
say_hi('first args',username='haha')*args -- 相当于 列表 **kwargs -- 相当于字典
用一个例子来演示会更加清晰
