Hackerrank Standardize Mobile Number Using Decorators Solution
Let's dive into decorators! You are given mobile numbers. Sort them in ascending order then print them in the standard format shown below:
+91 xxxxx xxxxx
The given mobile numbers may have , or written before the actual digit number. Alternatively, there may not be any prefix at all.
The first line of input contains an integer , the number of mobile phone numbers.
lines follow each containing a mobile number.
Print mobile numbers on separate lines in the required format.
3 07895462130 919875641230 9195969878
+91 78954 62130 +91 91959 69878 +91 98756 41230
Like most other programming languages, Python has the concept of closures. Extending these closures gives us decorators, which are an invaluable asset. You can learn about decorators in 12 easy steps here.
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 apply it to the function.
Solution in Python
def wrapper(f): def fun(l): f("+91 "+i[-10:-5]+" "+i[-5:] for i in 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)