list comprehension in python (struggling to understand the logic)

Question

SOF community.

I am attempting to delete the last character within a string and to replace it by 'ies' using list comprehension.

What the below expression attempts to do is just that: delete last character using index position and concatenate it with 'ies' afterwards.

word = [(word.del[-1]) + 'ies' for character in word]

new to code. Apologies if logic is off (which im sure it is)

question from:https://stackoverflow.com/questions/65834609/list-comprehension-in-python-struggling-to-understand-the-logic

Answer 1

So, let's take a string

s = 'lady'

Now, in python, string is immutable. By that, it means you can not alter the string variable s once it is created. So what effectively you want to to do is to take all the characters of s until but not included the last character y and add ies at the end.

Now, the copy can be done using slicing operator

new_s = s[:-1] + "ies"