0

I have a huge list of lists(there are 518 lists with each one of them having different amount of sublists, but i cannot upload all of it because i exceed word limit so hopefully it can work even with this sample)

fall_3_list = [[['CS322', 'CS312', 'CS300', 'GER', 'FREE'], ['FREE', 'CS300', 'CS312', 'CS322', 'GER']], [['', '', 'CS300', 'FREE', 'CS312'], ['', 'FREE', 'CS300', '', 'CS312'], ['', 'FREE', 'CS300', '', 'CS312']], [['CS322', 'GER', 'GER', 'CS321', 'STAT205']], [['FREE', 'CS322', 'STAT205', 'GER', 'CS312'], ['FREE', 'CS312', 'CS322', 'GER', 'STAT205'], ['GER', 'FREE', 'CS312', 'CS322', 'STAT205'], ['CS322', 'FREE', 'CS312', 'GER', 'STAT205']], [['FREE', 'CS306', 'CS310', 'GER', 'FREE'], ['CS306', 'CS310', 'GER', 'FREE', 'FREE'], ['CS306', 'CS310', 'GER', 'FREE', 'FREE'], ['CS306', 'GER', 'FREE', 'CS310', 'GER'], ['CS310', 'CS306', 'FREE', 'GER', 'GER'], ['CS310', 'CS306', 'FREE', 'GER', 'FREE'], ['FREE', 'CS306', 'GER', 'CS310', 'FREE'], ['FREE', 'CS306', 'GER', 'CS310', 'FREE']], [['CS321', 'CS300', 'CS306', 'GER', 'CS325']], [['CS310', 'CS300', 'CS450', 'CS312', 'FREE']], [['CS310', 'CS322', 'GER', 'GER', ''], ['CS310', 'CS322', 'GER', 'GER', '']], [['CS322', 'CS300', 'CS306', 'CS321', 'STAT205']], [['FREE', 'CS300', 'CS306', 'STAT205', 'CS322'], ['CS300', 'CS306', 'CS322', 'STAT205', 'FREE'], ['CS300', 'CS306', 'CS322', 'STAT205', 'FREE'], ['CS306', 'CS300', 'CS322', 'STAT205', 'FREE'], ['CS306', 'CS300', 'CS322', 'STAT205', 'FREE'], ['CS322', 'CS306', 'CS300', 'FREE', 'STAT205'], ['CS322', 'CS300', 'CS306', 'FREE', 'STAT205']], [['CS310', 'FREE', 'CS312', '', 'CS325']], [['CS206', 'CS306', 'CS322', 'FREE', 'CS325']], [['FREE', 'FREE', 'GER', '', 'CS321'], ['FREE', '', 'FREE', 'CS321', 'GER'], ['FREE', '', 'FREE', 'CS321', 'GER'], ['FREE', '', 'FREE', 'CS321', 'GER'], ['FREE', '', 'FREE', 'CS321', 'GER'], ['', 'FREE', 'FREE', 'GER', 'CS321'], ['', 'FREE', '', 'GER', 'CS321'], ['', 'FREE', '', 'GER', 'CS321'], ['FREE', '', 'FREE', 'GER', 'CS321'], ['FREE', '', 'FREE', 'GER', 'CS321'], ['FREE', '', 'FREE', 'GER', 'CS321']], [['MATH220', 'CS450', 'CS300', 'FREE', 'FREE']], [['FREE', 'CS312', 'MATH220', 'CS310', ''], ['FREE', 'CS312', 'MATH220', 'CS310', ''], ['FREE', 'CS312', 'MATH220', 'CS310', ''], ['MATH220', 'FREE', 'CS312', 'CS310', '']], [['', 'FREE', 'CS322', 'CS321', 'FREE'], ['', 'FREE', 'CS321', 'CS322', ''], ['', 'FREE', 'CS321', 'CS322', ''], ['', 'FREE', 'CS322', 'CS321', 'FREE'], ['FREE', '', 'FREE', 'CS322', 'CS321'], ['FREE', '', 'FREE', 'CS322', 'CS321'], ['FREE', '', 'FREE', 'CS322', 'CS321']], [['CS450', '', 'CS312', 'GER', 'CS321']], [['CS306', 'CS321', 'STAT205', 'CS310', '']], [['', 'FREE', 'CS312', 'CS306', 'STAT205']], [['FREE', 'CS312', 'GER', 'CS322', 'GER'], ['CS312', 'FREE', 'CS322', 'GER', 'GER'], ['CS312', 'FREE', 'CS322', 'GER', 'GER'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'FREE', 'GER'], ['CS322', 'FREE', 'CS312', 'FREE', 'GER'], ['CS322', 'FREE', 'CS312', 'FREE', 'GER'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE'], ['CS322', 'FREE', 'CS312', 'GER', 'FREE']], [['FREE', 'FREE', '', 'FREE', 'CS312'], ['FREE', 'FREE', '', 'FREE', 'CS312']], [['FREE', 'FREE', 'GER', 'CS325', 'STAT205'], ['FREE', 'FREE', 'GER', 'CS325', 'STAT205']], [['CS306', 'MATH220', 'FREE', 'CS322', 'GER']], [['CS322', 'CS306', 'CS300', 'GER', 'CS321'], ['CS322', 'CS306', 'CS300', 'GER', 'CS321'], ['CS322', 'CS306', 'CS300', 'GER', 'CS321'], ['CS322', 'CS306', 'CS300', 'GER', 'CS321'], ['CS322', 'CS306', 'CS300', 'GER', 'CS321'], ['CS322', 'CS306', 'CS300', 'GER', 'CS321'], ['GER', 'CS300', 'CS306', 'CS321', 'CS322'], ['GER', 'CS306', 'CS300', 'CS322', 'CS321'], ['GER', 'CS306', 'CS300', 'CS322', 'CS321'], ['GER', 'CS300', 'CS306', 'CS322', 'CS321'], ['GER', 'CS300', 'CS306', 'CS321', 'CS322'], ['GER', 'CS300', 'CS306', 'CS321', 'CS322'], ['CS300', 'CS306', 'GER', 'CS322', 'CS321'], ['CS322', 'CS306', 'CS300', 'CS321', 'GER'], ['CS322', 'CS306', 'CS300', 'CS321', 'GER']], [['FREE', 'CS300', 'CS306', 'GER', ''], ['FREE', 'CS306', 'CS300', 'GER', '']], [['CS310', 'CS306', 'CS300', 'CS322', 'CS312'], ['CS300', 'CS306', 'CS322', 'CS310', 'CS312']], [['FREE', 'CS322', 'STAT205', 'CS310', 'FREE'], ['CS322', 'FREE', 'STAT205', 'CS310', 'FREE']], [['CS450', 'CS300', 'STAT205', 'CS310', 'GER']], [['CS322', 'FREE', 'CS450', 'CS321', 'CS325'], ['CS322', 'FREE', 'CS450', 'CS321', 'CS325'], ['CS322', 'FREE', 'CS450', 'CS321', 'CS325']], [['CS300', 'CS310', 'GER', 'STAT205', 'MAJOR']], [['FREE', 'FREE', 'FREE', '', 'GER'], ['', '', '', 'FREE', 'GER']], [['FREE', 'CS206', '', 'GER', 'CS321']], [['CS312', 'GER', 'STAT205', 'CS325', ''], ['', 'CS312', 'GER', 'CS325', 'STAT205']], [['FREE', 'CS312', 'CS310', 'ENG204', 'GER']], [['CS450', 'CS306', 'FREE', 'CS310', 'FREE']], [['CS322', 'FREE', 'MATH220', 'CS321', 'CS325']], [['CS206', 'CS312', 'CS306', 'CS322', 'FREE']], [['MATH220', 'CS306', 'CS300', 'GER', 'CS321']], [['FREE', 'GER', 'FREE', 'GER', 'CS325'], ['FREE', 'GER', 'FREE', 'GER', 'CS325'], ['FREE', 'GER', 'FREE', 'GER', 'CS325'], ['FREE', 'FREE', 'GER', 'GER', 'CS325']], [['STAT205', 'FREE', 'CS312', 'CS310', 'GER'], ['STAT205', 'FREE', 'CS312', 'CS310', 'GER'], ['STAT205', 'FREE', 'CS312', 'CS310', 'GER'], ['FREE', 'CS312', 'CS310', 'STAT205', 'GER'], ['CS312', 'FREE', 'STAT205', 'CS310', 'GER']], [['CS322', 'CS312', 'CS310', 'CS300', 'GER']], [['CS450', 'CS306', 'CS321', 'STAT205', 'GER']], [['CS450', 'CS300', 'GER', 'CS322', 'CS306']], [['CS310', 'FREE', 'CS322', 'GER', 'GER'], ['CS310', 'FREE', 'CS322', 'GER', 'GER'], ['CS310', 'CS322', 'GER', 'FREE', 'GER'], ['CS322', 'FREE', 'CS310', 'GER', 'FREE']], [['CS450', 'CS300', 'GER', 'CS310', 'FREE']], [['CS310', 'CS306', 'CS450', 'ENG204', 'CS312'], ['CS310', 'CS450', 'CS306', 'ENG204', 'CS312']], [['CS206', 'CS312', 'CS310', 'CS306', 'FREE']], [['CS306', 'CS450', 'CS312', 'GER', '']], [['CS310', 'FREE', 'CS300', 'CS321', '']], [['FREE', 'CS450', '', 'CS321', 'STAT205']], [['', 'FREE', '', 'CS321', 'STAT205'], ['', 'FREE', 'FREE', 'CS321', 'STAT205'], ['FREE', 'FREE', '', 'CS321', 'STAT205']], [['', 'FREE', 'CS322', 'CS321', 'FREE'], ['', 'FREE', 'CS321', 'CS322', ''], ['', 'FREE', 'CS321', 'CS322', ''], ['', 'FREE', 'CS322', 'CS321', 'FREE'], ['FREE', '', 'FREE', 'CS322', 'CS321'], ['FREE', '', 'FREE', 'CS322', 'CS321'], ['FREE', '', 'FREE', 'CS322', 'CS321']], [['MATH220', 'FREE', 'CS306', 'CS325', 'FREE'], ['MATH220', 'FREE', 'CS306', 'CS325', 'FREE']], [['STAT205', 'CS322', 'MATH220', 'GER', 'FREE']], [['FREE', 'GER', 'CS310', 'CS312', 'FREE'], ['FREE', 'CS310', 'GER', 'CS312', 'GER'], ['FREE', 'CS312', 'CS310', 'FREE', 'GER'], ['CS312', 'CS310', 'FREE', 'FREE', 'GER'], ['CS312', 'CS310', 'GER', 'FREE', 'GER'], ['FREE', 'CS312', 'GER', 'CS310', 'FREE'], ['CS310', 'FREE', 'CS312', 'GER', 'FREE'], ['CS310', 'CS312', 'FREE', 'GER', 'FREE'], ['CS310', 'CS312', 'FREE', 'GER', 'FREE'], ['CS310', 'FREE', 'CS312', 'GER', 'GER'], ['CS312', 'FREE', 'CS310', 'GER', 'FREE'], ['FREE', 'CS312', 'CS310', 'GER', 'FREE']], [['', '', 'FREE', 'CS321', 'CS312'], ['', 'FREE', 'CS312', 'CS321', 'FREE'], ['FREE', 'CS312', '', 'CS321', ''], ['FREE', 'FREE', 'CS312', '', 'CS321']], [['CS310', 'FREE', 'STAT205', 'GER', '']], [['CS300', 'CS306', 'FREE', 'GER', 'STAT205'], ['CS300', 'CS306', 'GER', 'FREE', 'STAT205'], ['CS306', 'CS300', 'GER', 'FREE', 'STAT205']], [['CS312', 'ENG204', 'CS450', 'CS310', 'FREE']], [['FREE', 'CS300', '', 'CS321', 'STAT205'], ['FREE', 'CS300', '', 'CS321', 'STAT205']], [['FREE', 'MATH220', 'CS306', 'GER', ''], ['CS306', '', 'FREE', 'MATH220', 'GER']], [['FREE', 'CS312', 'GER', 'CS325', 'STAT205'], ['FREE', 'STAT205', 'CS325', 'GER', 'CS312']], [['CS322', 'CS306', 'CS450', '', 'CS321']], [['CS312', 'FREE', 'GER', 'CS322', ''], ['FREE', 'CS312', 'GER', 'CS322', ''], ['CS312', 'CS322', 'GER', 'FREE', ''], ['CS312', 'CS322', 'GER', 'FREE', ''], ['CS312', 'CS322', 'GER', 'FREE', ''], ['FREE', 'CS322', 'GER', 'CS312', ''], ['FREE', '', 'CS322', 'GER', 'CS312'], ['GER', 'CS312', '', 'CS322', 'FREE'], ['GER', 'CS312', '', 'CS322', 'FREE'], ['', 'FREE', 'CS312', 'GER', 'CS322'], ['CS322', '', 'FREE', 'GER', 'CS312'], ['', 'FREE', 'CS312', 'GER', 'CS322'], ['FREE', '', 'CS312', 'CS322', 'GER'], ['CS322', '', 'FREE', 'GER', 'CS312'], ['', 'FREE', 'CS312', 'CS322', 'GER'], ['GER', 'CS312', '', 'FREE', 'CS322'], ['GER', 'CS312', '', 'FREE', 'CS322']], [['CS306', 'FREE', '', 'CS322', 'CS321'], ['CS306', 'FREE', '', 'CS322', 'CS321'], ['CS306', 'FREE', '', 'CS321', 'CS322'], ['CS322', '', 'CS306', 'FREE', 'CS321'], ['CS322', '', 'CS306', 'FREE', 'CS321'], ['', 'FREE', 'CS306', 'CS322', 'CS321'], ['', 'FREE', 'CS306', 'CS321', 'CS322'], ['CS322', 'FREE', 'CS306', '', 'CS321']]]

and what I want to do is take the first sublist of each listlike this:

combination_fall_3 = [item[0] for item in fall_3_list]

but I keep getting the same error:

combination_fall_3 = [item[0] for item in fall_3_list] IndexError: list index out of range

But for the rest of the lists that I have, I have 15 lists that look like fall_3_list, this doesn't happen. Of course, they all have different length, not 518 as this one but I use exact same code. I cannot understand why I get this error since I do not define the length of combination_fall_3 before(in case it was an error because I gave it smaller length) and I am just asking for first sublist of each list to be added.

Improve this question
3
  • One of the elements of fall_3_list must be empty. Commented May 19, 2020 at 1:28
  • you mean empty string or empty sublist? @DanielWalker Commented May 19, 2020 at 1:28
  • Empty meaning with no elements inside, much like []. In that case, the item[0] access attempt would fail. Commented May 19, 2020 at 1:30

1 Answer 1

Reset to default
1

This is because some of your lists will have no items in it and item[0] will not exist.

To diagnose these kind of errors you have to look at which indices you use. On the line that throws the error you only try to "index" (grab an element of) 1 list: item[0]. If the error then reports that the "list index is out of range" it means that element 0 in that list does not exist.

You can fix this for example like this:

combination_fall_3 = [item[0] for item in fall_3_list if item]

Where the sublist item only evaluates to False if it is empty.

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

Comments

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.