def add_number(func):
def adder(arg):
return func(arg)+100
return adder
def f(x):
return x
f=add_number(f)
print f(20)

def add_number(func):
def adder(arg):
return func(arg)+100
return adder
@add_number
def f(x):
return x
print f(20)

from decorator import decorator
@decorator
def wrapper(func,arg):
return func(arg)+100
@wrapper
def f(x):
return x
print f(20)

@decorator
def wrapper(f,arg1,*args,**kwargs):
print "I am just a wrapper~"
return f(arg1,*args,**kwargs)
@wrapper
def f(arg1,*args,**kwargs):
print arg1
for eacheArg in args:
print 'non-keyword arg:',eacheArg
for eachKw in kwargs.keys():
print 'keyword arg: %s:%d' % (eachKw,kwargs[eachKw])
args=('Joy','Steve')
kwargs={"age":20}
f('China',*args,**kwargs)

I am just a wrapper~
China
non-keyword arg: Joy
non-keyword arg: Steve
keyword arg: age:20

def test_var_args_call(arg1, arg2, arg3):
print "arg1:", arg1
print "arg2:", arg2
print "arg3:", arg3
args=(1,2,3)
kwargs ={"arg1":"1","arg3": 3, "arg2": "2"}
test_var_args_call(*args)
print '-----------------'
test_var_args_call(**kwargs)

import time
def log(func):
def wrapper(*args, **kw):
print '[%s] %s() was called...' % (time.ctime(),func.__name__)
return func(*args, **kw)
return wrapper
@log
def foo():
pass
for i in range(4):
foo()
time.sleep(1)

[Wed Jul 27 09:17:23 2016] foo() was called...
[Wed Jul 27 09:17:24 2016] foo() was called...
[Wed Jul 27 09:17:25 2016] foo() was called...
[Wed Jul 27 09:17:26 2016] foo() was called...