def debug(func): html
def wrapper(*args, **kwargs): # 指定宇宙無敵參數 python
print "[DEBUG]: enter {}()".format(func.__name__)app
print 'Prepare and say...', 函數
return func(*args, **kwargs) this
return wrapper # 返回 spa
@debug debug
def say(something): code
print "hello {}!".format(something)orm
Python提供了可變參數*args
和關鍵字參數**kwargs
,有了這兩個參數,裝飾器就能夠用於任意目標函數了。htm
參考:https://www.cnblogs.com/cicaday/p/python-decorator.html
我本身的例子
#!/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) #裝飾器內部函數的參數等於被修飾函數的參數
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 -- 至關於 列表 **kwargs -- 至關於字典