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Home Forums Write a python program to sort a list of objects based on a specific property. – MindStick
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1 Answers

Aryan Kumar
Aryan Kumar 19 Jun 2023
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class Person:
  def __init__(self, name, age):
    self.name = name
    self.age = age

  def __lt__(self, other):
    return self.age < other.age


def sort_by_age(people):
  """
  Sorts a list of people by age.

  Args:
    people: The list of people to sort.

  Returns:
    A sorted list of people.
  """

  sorted_people = sorted(people, key=lambda person: person.age)

  return sorted_people


if __name__ == "__main__":
  people = [
      Person("John Doe", 30),
      Person("Jane Doe", 25),
      Person("Peter Smith", 40),
      Person("Mary Smith", 35),
  ]

  sorted_people = sort_by_age(people)

  for person in sorted_people:
    print(person.name, person.age)

This program works by first defining a class called Person. This class represents a person with a name and an age. The class defines a __lt__() method that compares two people by their age. The method returns True if the first person is less than the second person, and False otherwise.

The sort_by_age() function takes a list of people as input and returns a sorted list of people. The function works by first using the sorted() function to sort the list of people. The sorted() function takes a key parameter that specifies a function to use for sorting the list. In this case, the key parameter is a lambda function that gets the age of a person. The sorted() function then returns a sorted list of people.

The main function of the program simply gets the list of people from the user and then calls the sort_by_age() function to sort the list of people. The main function then prints the sorted list of people to the console.

To run the program, you can save it as a Python file and then run it from the command line. For example, if you save the program as sort_by_age.py, you can run it by typing the following command into the command line:

Code snippet

python sort_by_age.py

This will print the sorted list of people to the console.

Here is an example of the output of the program:

Code snippet

$ python sort_by_age.py
Jane Doe 25
John Doe 30
Mary Smith 35
Peter Smith 40

As you can see, the output of the program is a sorted list of people, with the people sorted by their age.

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