python可变参数的使用注意

>>> def myfun(a, *b):

...     print(a

)...     print(b)

...

>>> myfun(a=1, 2,3,4) 

File "<stdin>", line 1

SyntaxError: positional argument follows keyword argument

>>> myfun(1, 2,3,4)

1

(2, 3, 4)

>>> def myfun(a, *b, c=None):

...     print(a)

...     print(b)

...     print(c)

...

>>> myfun(1, 2,3,4)

1

(2, 3, 4)

None

>>> myfun(1, 2,3,c=4)

1

(2, 3)

4