args就是所有参数的数组，kwargs就是当你传入key=value是存储的字典，当函数的参数不确定时，可以使用*args 和kwargs，*args 没有key值，kwargs有key值
def fun_var_args ( farg , * args ) :
print "arg:" , farg
for value in args :
print "another arg:" , value
fun_var_args ( 1 , "two" , 3 ) # *args可以当作可容纳多个变量组成的list
result:
arg : 1
another arg : two
another arg : 3
**kwargs:
def fun_var_kwargs ( farg , * * kwargs ) :
print "arg:" , farg
for key in kwargs :
print "another keyword arg: %s: %s" % ( key , kwargs [ key ] )
fun_var_kwargs ( farg = 1 , myarg2 = "two" , myarg3 = 3 ) # myarg2和myarg3被视为key， 感觉**kwargs可以当作容纳多个key和value的dictionary
result:
arg : 1
another keyword arg : myarg2 : two
another keyword arg : myarg3 : 3
也可以用下面的形式：
def fun_var_args_call ( arg1 , arg2 , arg3 ) :
print "arg1:" , arg1
print "arg2:" , arg2
print "arg3:" , arg3
args = [ "two" , 3 ] #list
fun_var_args_call ( 1 , * args )
result：
arg1 : 1
arg2 : two
arg3 : 3
def fun_var_args_call ( arg1 , arg2 , arg3 ) :
print "arg1:" , arg1
print "arg2:" , arg2
print "arg3:" , arg3
kwargs = { "arg3" : 3 , "arg2" : "two" } # dictionary
fun_var_args_call ( 1 , * * kwargs )
result：
arg1 : 1
arg2 : "two"
arg3 : 3
当所有传参为key=value形式将返回字典形式
