???????

????????????????????????????????????е???????????????????????????Щ????????????????? ??????? ????????????????????????????λ????????????????????????????????????Ρ?

???????????? ???? ???????????????????????????????ú????????????????????????????????????????????????????????????Щ?????????

??ù??????

??7.6 ??ù??????

#!/usr/bin/python
# Filename: func_key.py

def func(a, b=5, c=10):
    print 'a is', a, 'and b is', b, 'and c is', c

func(3, 7)
func(25, c=24)
func(c=50, a=100)

????????code/func_key.py??

???

$ python func_key.py
a is 3 and b is 7 and c is 10
a is 25 and b is 5 and c is 24
a is 100 and b is 5 and c is 50

????ι???

???func???????????????????????????????????????????

????????ú???????? func(3, 7)??????a????3??????b????7????????c???????10??

????????ú???func(25, c=24)???????????ε?λ?????a????25???????????????????????????c????24??????b???????????5??

??????????func(c=50, a=100)???????????ù????????????????????????????????????У?a??c?????壬?????????????a?????????c?????