HackerRank Python Solution - Closures and Decorators - Standardize Mobile Number Using Decorators

• Let's dive into decorators! You are given N mobile numbers. Sort them in ascending order then print them in the standard format shown below:

+91 xxxxx xxxxx

• The mobile numbers may have +91, 91, or 0 written before the actual 10-digit number. Alternatively, there may not be any prefix at all.

Input Format:

• The first input line contains an integer N, the number of mobile phone numbers. N lines follow each having a mobile number.

Output Format:

• Print N mobile numbers on separate lines in the required format.

Sample Input:

3
07895462130
919875641230
9195969878

Sample Output:

+91 78954 62130
+91 91959 69878
+91 98756 41230

Concept:

• To solve the above question, make a list of the mobile numbers and pass it to a function that sorts the array in ascending order. Make a decorator that standardizes the mobile numbers and applies them to the function.

Solution:

import re

def wrapper(f):
    def fun(l):
        decorated_l = ['+91 {} {}'.format(n[-10: -5], n[-5:]) for n in l]
        return f(decorated_l)
    return fun

@wrapper
def sort_phone(l):
    print(*sorted(l), sep='\n')

if __name__ == '__main__':
    l = [input() for _ in range(int(input()))]
    sort_phone(l) 

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