'Split from list in python

In my list I have few items, i.e.,

List=['a/c/d/eww/d/df/rr/e.jpg', 'ss/dds/ert/eww/ees/err/err.jpg','fds/aaa/eww/err/dd.jpg']

I want to keep only from 'eww' till last '/'

Modified_list=['eww/d/df/rr/', 'eww/ees/err/err.jpg','eww/err/']

python python-3.x

Solution 1:^[1]

Use find(sub_str) function.

new_list = [item[item.find("eww"):] for item in List]
print(new_list)

Output:

['eww/d/df/rr/e.jpg', 'eww/ees/err/err.jpg', 'eww/err/dd.jpg']

Solution 2:^[2]

Try using this list comprehension, assuming that the eww string is present in all the elements of the input list:

lst = ['a/c/d/eww/d/df/rr/e.jpg', 'ss/dds/ert/eww/ees/err/err.jpg', 'fds/aaa/eww/err/dd.jpg']
modified_list = [x[x.index('eww'):x.rindex('/')+1] for x in lst]

It works as expected:

modified_list
=> ['eww/d/df/rr/', 'eww/ees/err/', 'eww/err/']

Solution 3:^[3]

new_list2=[item[item.find('eww'):item.rfind('/')+1] for item in List]
print(new_list2)

output= ['eww/d/df/rr/', 'eww/ees/err/', 'eww/err/']

Solution 4:^[4]

Here are the steps I would do:

split the string after eww assuming that each string contains 'eww' you can split the string like this: split = 'eww'+string.split('eww')[1]
Now, you have to loop over each character in the remaining string and save the index of the last /
Remove everything after the last / with the index from step 3: split = split[:splitIndex]
Now, you just have to put everything in a loop that iterates over the list and execute each of the steps above on each element of the list and save the modified string to the ModiefiedList list.

Solution 5:^[5]

You can use a regex in a list comprehension.

A perfect use case for the new walrus operator (python ?3.8):

List=['a/c/d/eww/d/df/rr/e.jpg',
      'ss/dds/ert/eww/ees/err/err.jpg',
      'fds/aaa/eww/err/dd.jpg']

import re
out = [m.group() if (m:=re.search('eww/(.*)/', s)) else s
       for s in List]

output:

['eww/d/df/rr/', 'eww/ees/err/', 'eww/err/']

NB. this keeps the original string in case of no match, if you rather want to drop it:

out = [m.group() for s in List if (m:=re.search('eww/(.*)/', s))]

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	TaQuangTu
Solution 2
Solution 3	zeeshan12396
Solution 4	Emely h
Solution 5	mozway

'Split from list in python

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Solution 4:[4]

Solution 5:[5]