Reverse List Function

PythonPythonBeginner
Practice Now

This tutorial is from open-source community. Access the source code

Introduction

In Python, lists and strings can be reversed using built-in functions. However, it is also possible to reverse a list or a string using slice notation.

In this challenge, you will write a function that reverses a list or a string using slice notation.


Skills Graph

%%%%{init: {'theme':'neutral'}}%%%% flowchart RL python(("Python")) -.-> python/DataStructuresGroup(["Data Structures"]) python(("Python")) -.-> python/FunctionsGroup(["Functions"]) python(("Python")) -.-> python/BasicConceptsGroup(["Basic Concepts"]) python/BasicConceptsGroup -.-> python/comments("Comments") python/DataStructuresGroup -.-> python/lists("Lists") python/DataStructuresGroup -.-> python/tuples("Tuples") python/FunctionsGroup -.-> python/function_definition("Function Definition") subgraph Lab Skills python/comments -.-> lab-13709{{"Reverse List Function"}} python/lists -.-> lab-13709{{"Reverse List Function"}} python/tuples -.-> lab-13709{{"Reverse List Function"}} python/function_definition -.-> lab-13709{{"Reverse List Function"}} end

Reverse List Function

Write a Python function called reverse(itr) that takes a list or a string as its argument and returns a new list or string that contains the elements or characters in reverse order.

Your function should have the following requirements:

  • The function should be named reverse
  • The function should take a single argument, which is a list or a string
  • The function should return a new list or string that contains the elements or characters in reverse order
  • The function should not modify the original list or string
def reverse(itr):
  return itr[::-1]
reverse([1, 2, 3]) ## [3, 2, 1]
reverse('snippet') ## 'teppins'

Summary

In this challenge, you learned how to reverse a list or a string using slice notation in Python. You wrote a function called reverse that takes a list or a string as its input and returns a new list or string that contains the elements or characters in reverse order. Remember that slice notation can be used to extract a range of elements from a list or a string.