Removing charaters from string in a list of list-CodePudding

I have a list, lst =[['ABC, CN', 'X'], ['DCS, BA', 'X'], ['SCS, TW', 'X'], ['SFA, GW', 'X']]. Want to remove the last 4 charaters in the in the first part of ever string? Is this possible?

Wanted outcome would be:

newlist = [['ABC', 'X'], ['DCS', 'X'], ['SCS', 'X'], ['SFA', 'X']]

I've tried:

newlist= [sub[:][: -1] for sub in list]

But this gives me:

newlist = [['ABC'], ['DCS'], ['SCS'], ['SFA']]

CodePudding user response：

You can use unpacking when iterate over elements of the list.

>>> [[a[:-4], b] for (a, b) in lst]
[['ABC', 'X'], ['DCS', 'X'], ['SCS', 'X'], ['SFA', 'X']]