Problem with sorted phone numbers from hackerrank-CodePudding

I know my attempt is very basic, so is my knowledge of python. the problem asks for getting multiple numbers from user and remove possible 0, 91, or 91 from their left side to make them 10 digit and then sort and print them.

I tried num_list[1] = num_list[1][len(num_list[1])-10:]. It works, so I tried to put it in list comprehension format I'm just studying, but it is not working then. I need help with how to do it hopefully to get a better understanding of when the comprehension format is supposed to be employed.

n = int(input()) # get number of phone numbers from user
num_list = [] # an empty list to store phone numbers in
num_list = [input() for _ in range(n)] # store phone numbers in num_list
##################################
num_list = [num_list[num] = num_list[num][len(num_list[num])-10:] for num in num_list]  #remove  possible 0,  91, 91 from beginning of numbers
########################################
num_list = sorted(num_list)
num_list = [" 91 " num[:5] " " num[5:] for num in num_list]
print(*num_list , sep="\n")

CodePudding user response：

You shouldn't assign directly within a list comprehension.

The syntax that you're looking for is:

num_list = [num[-10:] for num in num_list]

which is logically equivalent to:

cleaned_list = []
for num in num_list:
    cleaned_list.append(num[-10:])
num_list = cleaned_list