Python基础之函数用法实例详解(2)

>>> def print_params(*params):
  　　 print params

>>> print_params('Testing')
('Testing',)
>>> print_params(1,2,3)
(1, 2, 3)

>>> def print_params_2(title,*params):
  　　 print title
  　　 print params

>>> print_params_2('params:',1,2,3)
params:
(1, 2, 3)
>>> print_params_2('Nothing:')
Nothing:
()

>>> print_params_2('Hmm...',something=42)
Traceback (most recent call last):
 File "<pyshell#112>", line 1, in <module>
  print_params_2('Hmm...',something=42)
TypeError: print_params_2() got an unexpected keyword argument 'something'

>>> def print_params(**params):
  　　 print params

>>> print_params(x=1,y=2,z=3)
{'y': 2, 'x': 1, 'z': 3}
>>> def parames(x,y,z=3,*pospar,**keypar):
  　　 print x,y,z
  　　 print pospar
  　　 print keypar

>>> parames(1,2,3,5,6,7,foo=1,bar=2)
1 2 3
(5, 6, 7)
{'foo': 1, 'bar': 2}
>>> parames(1,2)
1 2 3
()
{}
>>> def print_params_3(**params):
  　　 print params

>>> print_params_3(x=1,y=2,z=3)
{'y': 2, 'x': 1, 'z': 3}
>>> #返回的是字典而不是元组
>>> #组合‘#'与'##'
>>> def print_params_4(x,y,z=3,*pospar,**keypar):
  　　 print x,y,z
  　　 print pospar
  　　 print keypar

>>> print_params_4(1,2,3,5,6,7,foo=1,bar=2)
1 2 3
(5, 6, 7)
{'foo': 1, 'bar': 2}
>>> print_params_4(1,2)
1 2 3
()
{}