可变长度参数

非关键字可变长参数（元组）

要特别注意默认参数的不同

def tupleVarArgs(arg1, arg2='defaultB', *theRest):
    'display regular args and non-keyword variable args'
    print 'formal arg 1:', arg1
    print 'formal arg 2:', arg1
    for eachXtrArg in theRest:
        print 'another arg:', eachXtrArg

>>> tupleVarArgs('abc', 123, 'xyz', 456.789)
formal arg 1: abc
formal arg 2: 123 # 注意默认参数
another arg: xyz
another arg: 456.789

关键字变量参数（字典）

def dictVarArgs(arg1, arg2='defaultB', **theRest):
    'display 2 regular args and keyword variable args'
    print 'formal arg1:', arg1
    print 'formal arg2:', arg2
    for eachXtrArg in theRest.keys():
        print 'Xtra arg %s: %s' % \
            (eachXtrArg, str(theRest[eachXtrArg]))

>>> dictVarArgs('one', d=10, e='zoo', men=('freud', 'gaudi'))
formal arg1: one
formal arg2: defaultB # 注意默认参数
Xtra arg men: ('freud', 'gaudi')
Xtra arg d: 10
Xtra arg e: zoo