#coding=utf8
__author__ = 'Administrator'
# Can be used when the parameters of a function are uncertain *args and **kwargs . *args There is no key Value, **kwargs There are key value
def fun_var_args(farg, *args):
print 'args:', farg
for value in args:
print 'another arg:',value
# *args Can be regarded as can hold more than one variable composition list or tuple
fun_var_args(1, 'two', 3, None)
#args: 1
#another arg: two
#another arg: 3
#another arg: None
def fun_var_kwargs(farg, **kwargs):
print 'args:',farg
for key in kwargs:
print 'another keyword arg:%s:%s' % (key, kwargs[key])
# myarg1,myarg2 and myarg3 Is seen as a key . feeling **kwargs Can be considered to hold more than one key and value the dictionary
fun_var_kwargs(1, myarg1='two', myarg2=3, myarg3=None)
# Output:
#args: 1
#another keyword arg:myarg1:two
#another keyword arg:myarg2:3
#another keyword arg:myarg3:None
def fun_args(arg1, arg2, arg3):
print 'arg1:', arg1
print 'arg2:', arg2
print 'arg3:', arg3
myargs = ['1', 'two', None] # Define a list
fun_args(*myargs)
# Output:
#arg1: 1
#arg2: two
#arg3: None
mykwargs = {'arg1': '1', 'arg2': 'two', 'arg3': None} # Define the dictionary type
fun_args(**mykwargs)
# Output:
#arg1: 1
#arg2: two
#arg3: None
# both
def fun_args_kwargs(*args, **kwargs):
print 'args:', args
print 'kwargs:', kwargs
args = [1, 2, 3, 4]
kwargs = {'name': 'BeginMan', 'age': 22}
fun_args_kwargs(args,kwargs)
# args: ([1, 2, 3, 4], {'age': 22, 'name': 'BeginMan'})
# kwargs: {}
fun_args_kwargs(1,2,3,a=100)
#args: (1, 2, 3)
#kwargs: {'a': 100}
fun_args_kwargs(*(1,2,3,4),**{'a':None})
#args: (1, 2, 3, 4)
#kwargs: {'a': None}
