如何用“-”为列表中的一项拆分字符串？

Question

I have a list with one item that I need to split by "-" to access the last segment of data:

a = ['1-35-047-13-6299\t1\n']

Normally, I would do this by using the following call:

test = a.split("-")

However, this yields the following error

>>> a = ['1-35-047-13-6299\t1\n']
>>> a
['1-35-047-13-6299\t1\n']
>>> test = a.split("-")
Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
AttributeError: 'list' object has no attribute 'split'
>>> 

How can I get at the last segment of data in the list item eg "6299\\t1\\n" using the split method?

Answer 1

test = a[0].split('-')[-1]
print test

Answer 2

You have at least two problems here. For one thing, as the error message says split expects a string rather than a list, but a is a list of strings rather than a string. So split needs a[0] for this specific case, or in general something you can trust to be a string.

Then there's the need to split off just the rightmost element. That's what rsplit is for, probably with the parameter that limits the number of splits. So bottom line you want something like:

test = a[0].rsplit('-',1)[1]

Even that will fail if your input string does not contain a - character - either capturing the whole output of rsplit and checking its length or using reverse indexing into its output would work to guard against that case.

Answer 3

the traceback show that : 'list' object has no attribute 'split'

'String' object has the attribute 'split', you can use a[i].split('-')