how to get second last and last value in a string after separator in python

Question

In Python, how do you get the last and second last element in string ? string "client_user_username_type_1234567" expected output : "type_1234567"

Answer 1

Try this :

>>> s = "client_user_username_type_1234567"
>>> '_'.join(s.split('_')[-2:])
'type_1234567'

Answer 2

You can also use re.findall :

import re
s = "client_user_username_type_1234567"
result = re.findall('[a-zA-Z]+_\d+$', s)[0]

Output:

'type_1234567'

Answer 3

There's no set function that will do this for you, you have to use what Python gives you and for that I present:

split slice and join

"_".join("one_two_three".split("_")[-2:])

In steps:

1. Split the string by the common separator, "_"

   s.split("_")

2. Slice the list so that you get the last two elements by using a negative index

   s.split("_")[-2:]

3. Now you have a list composed of the last two elements, now you have to merge that list again so it's like the original string, with separator "_".

   "_".join("one_two_three".split("_")[-2:])

That's pretty much it. Another way to investigate is through regex.