How to get string list index?

Question

I have a list text_lines = ['asdf','kibje','ABC','beea'] and I need to find an index where string ABCappears.

ABC = [s for s in text_lines if "ABC" in s]

ABC is now "ABC".
How to get index?

possible duplicate of [Finding the index of an item given a list containing it in Python](http://stackoverflow.com/questions/176918/finding-the-index-of-an-item-given-a-list-containing-it-in-python) — Wim Ombelets, Jul 24 '14 at 13:55

wim · Answer 1 · 2014-07-24T14:43:44.487

4

Greedy (raises exception if not found):

index = next(i for i, s in enumerate(text_lines) if "ABC" in s)

Or, collect all of them:

indices = [i for i, s in enumerate(text_lines) if "ABC" in s]

edited Jul 24 '14 at 14:43

answered Jul 24 '14 at 13:54

wim

Thanks. One more thing: I would need to include `*ABC*`, so all occurances of ABC in any string would be reported (their indexes I ment). Possible? – Danijel Jul 24 '14 at 13:59
`ValueError: need more than 1 value to unpack` Any idea? – Danijel Jul 24 '14 at 14:07
It needs to return `ABC` as substring too, sorry if I was not clear. So this XYZABCXYZ would also be detected. – Danijel Jul 24 '14 at 14:09
@Danijel the last one fails if you only have one "ABC" in your list – Padraic Cunningham Jul 24 '14 at 14:12
1

@Danijel fixed ValueError sorry – wim Jul 24 '14 at 14:44

myildirim · Answer 2 · 2014-07-24T13:59:57.033

0

Did you mean the index of "ABC" ?

If there is just one "ABC", you can use built-in index() method of list:

text_lines.index("ABC")

Else, if there are more than one "ABC"s, you can use enumerate over the list:

indices = [idx for idx,val in enumerate(text_lines) if val == "ABC"]

edited Jul 24 '14 at 13:59

answered Jul 24 '14 at 13:54

myildirim

score 0 · Answer 3 · answered Jul 24 '14 at 13:54

0

text_lines = ['asdf','kibje','ABC','beea']

abc_index = text_lines.index('ABC')

if 'ABC' appears only once. the above code works, because index gives the index of first occurrence.

for multiple occurrences you can check wim's answer

answered Jul 24 '14 at 13:54

shshank

Thanks. I need to detect not identical strings, but substrings too, like `xABCyz`. Do you have solution for that? – Danijel Jul 24 '14 at 14:22

score 0 · Answer 4 · answered Jul 24 '14 at 13:56

0

Simple python list function.

index = text_lines.index("ABC")

If the string is more complicated, you may need to combine with regex, but for a perfect match this simple solution is best.

answered Jul 24 '14 at 13:56

Andrew M

4 Answers4