part 2: decorator装饰器

 1 def is_admin(f):
 2     def wrapper(*args, **kwargs):
 3         if kwargs.get(‘usrename‘) != ‘admin‘:
 4             raise Exception("Now allow")
 5         return f(*args, **kwargs)
 6     return wrapper
 7 
 8 def foobar(username="soneone"):
 9     """ DOcarzy stuff """
10     pass
11 
12 
13 >>> foobar.func_doc
14 ‘ DOcarzy stuff ‘
15 >>> foobar.__name__
16 ‘foobar‘
17 >>> @is_admin
18 def foobar(username="someone"):
19     """Do carzy stuff"""
20     pass
21 
22 >>> foobar.__doc__
23 >>> foobar.__name__
24 ‘wrapper‘
25 >>> 

 1 import functools 
 2 def is_admin(f):
 3     @functools.wraps(f)
 4     def wrapper(*args, **kwargs):
 5         if kwargs.get(‘usrename‘) != ‘admin‘:
 6             raise Exception("Now allow")
 7         return f(*args, **kwargs)
 8     return wrapper
 9 
10 def foobar(username="soneone"):
11     """ DOcarzy stuff """
12     pass
13 
14 
15 >>> foobar.__name__
16 ‘foobar‘
17 >>> foobar.__doc__
18 ‘ DOcarzy stuff ‘
19 >>> 

 1 import functools
 2 import inspect
 3 
 4 def is_admin(f):
 5     @functools.wraps(f)
 6     def wrapper(*args, **kwargs):
 7 
 8         func_args = inspect.getcallargs(f,*args,**kwargs)
 9         print func_args
10         if func_args.get(‘username‘) != ‘admin‘:
11             raise Exception("Now allow")
12         return f(*args, **kwargs)
13     return wrapper
14 
15 @is_admin
16 def foobar(username, type="chocolate"):
17     """ DOcarzy stuff """
18     pass
19 
20 >>> foobar(username=‘admin‘)
21 {‘username‘: ‘admin‘, ‘type‘: ‘chocolate‘}
22 >>>