Replace string in specific index in list of lists python

Question

How can i replace a string in list of lists in python but i want to apply the changes only to the specific index and not affecting the other index, here some example:

mylist = [["test_one", "test_two"], ["test_one", "test_two"]]

i want to change the word "test" to "my" so the result would be only affecting the second index:

mylist = [["test_one", "my_two"], ["test_one", "my_two"]]

I can figure out how to change both of list but i can't figure out what I'm supposed to do if only change one specific index.

how about tuple in list ? it won't accept reassigning the value? — Rief
– Rief, Commented Mar 2, 2020 at 3:51

Chris · Accepted Answer · 2020-03-02 03:43:00Z

3

Use indexing:

newlist = []
for l in mylist:
    l[1] = l[1].replace("test", "my")
    newlist.append(l)
print(newlist)

Or oneliner if you always have two elements in the sublist:

newlist = [[i, j.replace("test", "my")] for i, j in mylist]
print(newlist)

Output:

[['test_one', 'my_two'], ['test_one', 'my_two']]

answered Mar 2, 2020 at 3:43

Chris

29.8k3 gold badges34 silver badges56 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Rusty Robot · Accepted Answer · 2020-03-02 03:43:14Z

2

There is a way to do this on one line but it is not coming to me at the moment. Here is how to do it in two lines.

for two_word_list in mylist:
    two_word_list[1] = two_word_list.replace("test", "my")

answered Mar 2, 2020 at 3:43

Rusty Robot

1,8652 gold badges14 silver badges29 bronze badges

Collectives™ on Stack Overflow

Replace string in specific index in list of lists python

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related