python用1234_如何使用python将[1,2,3,4]更改为'1234'

s.join(a) concatenates all items in the sequence a by the string s, for example,

>>> ','.join(['foo', 'bar', '', 'baz'])

'foo,bar,,baz'

Note that .join can only join string sequences. It won't call str automatically.

>>> ''.join([1,2,3,4])

Traceback (most recent call last):

File "", line 1, in

TypeError: sequence item 0: expected string, int found

Therefore we need to first map all items into strings first.