Decorators 2 – Name Directory in Python | HackerRank Programming Solutions | HackerRank Python Solutions

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Introduction To Python

Python is a widely-used, interpreted, object-oriented, and high-level programming language with dynamic semantics, used for general-purpose programming. It was created by Guido van Rossum, and first released on February 20, 1991.

Python is a computer programming language often used to build websites and software, automate tasks, and conduct data analysis. It is also used to create various machine learning algorithm, and helps in Artificial Intelligence. Python is a general purpose language, meaning it can be used to create a variety of different programs and isn’t specialized for any specific problems. This versatility, along with its beginner-friendliness, has made it one of the most-used programming languages today. A survey conducted by industry analyst firm RedMonk found that it was the most popular programming language among developers in 2020.

Link for the Problem – Decorators 2 – Name Directory in Python – HackerRank Solution

Decorators 2 – Name Directory in Python – HackerRank Solution

Problem:

Let’s use decorators to build a name directory! You are given some information about  people. Each person has a first name, last name, age and sex. Print their names in a specific format sorted by their age in ascending order i.e. the youngest person’s name should be printed first. For two people of the same age, print them in the order of their input.

For Henry Davids, the output should be:

Mr. Henry Davids

For Mary George, the output should be:

Ms. Mary George

Input Format

The first line contains the integer , the number of people.
 lines follow each containing the space separated values of the first name, last name, age and sex, respectively.

Constraints

Output Format

Output  names on separate lines in the format described above in ascending order of age.

Sample Input

3
Mike Thomson 20 M
Robert Bustle 32 M
Andria Bustle 30 F

Sample Output

Mr. Mike Thomson
Ms. Andria Bustle
Mr. Robert Bustle

Concept

For sorting a nested list based on some parameter, you can use the itemgetter library. You can read more about it here.

Decorators 2 – Name Directory in Python – HackerRank Solution

import operator

def person_lister(f):
    def inner(people):
        # Decorators 2 - Name Directory in Python - Hacker Rank Solution START
        # complete the function
        return map(f, sorted(people, key=lambda x: int(x[2])))
        # Decorators 2 - Name Directory in Python - Hacker Rank Solution END
    return inner

@person_lister
def name_format(person):
    return ("Mr. " if person[3] == "M" else "Ms. ") + person[0] + " " + person[1]

if __name__ == '__main__':
    people = [input().split() for i in range(int(input()))]
    print(*name_format(people), sep='\n')