python中的函数用法入门教程(2)

def run(name,**args): 
    keys = args.keys() 
    for k in keys : 
       print k,args[k] 
 
>>> run('nana',type='open') 
type open 
>>> run('nana',type='open',title='gogo') 
type open 
title gogo 

#*arg 必须在**args的前面 
def run(name,*arg,**args): 
    for a in arg :print a 
    keys = args.keys() 
    for k in keys : 
       print k,args[k] 
>>> run('nn','mm',1,2,'oo',type='open',title='gogo') 
mm 
1 
2 
oo 
type open 
title gogo 

>>> range(3, 6)       # normal call with separate arguments 
[3, 4, 5] 
>>> args = [3, 6] 
>>> range(*args)      # call with arguments unpacked from a list 
[3, 4, 5] 

>>> def make_incrementor(n): 
...   return lambda x: x + n #相当于创建了一个一x为参数的匿名函数？ 
... 
>>> f = make_incrementor(42)#f = make_incrementor(n=42)，设置n的值 
>>> f(0)#其实调用的是匿名函数？ 
42 
>>> f(1) 
43 
 
#看下面一个例子报的错误就可以明白一点了 
>>>def t(n): 
...     print x*n 
>>>m = t(2) 
Traceback (most recent call last): 
 File "<pyshell#85>", line 1, in <module> 
  m = t(2) 
 File "<pyshell#84>", line 2, in t 
  print x*n 
NameError: global name 'x' is not defined 

>>> x =10 
>>> def t(n): 
...    print x*n 
>>> m = t(2) 
20