Muhammad Raza
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One Liners Python Edition

Twelve Python one-liners I use often: reverse a string, dedupe a list, flatten nested lists, merge dictionaries, find the most common item, and more.

Muhammad Raza · 2 min read #python

I’ve written Python for about three years now, and one-liners still surprise me with how much they can do. Here’s a collection of the ones I like best, useful whether you’re new to the language or have been at it a while.

  1. Reverse a String:
python
reversed_string = "Hello World"[::-1]
  1. Check if a Number is Even:
python
is_even = lambda x: x % 2 == 0
  1. Find the Intersection of Two Lists:
python
intersection = list(set(list1) & set(list2))
  1. Remove Duplicates from a List:
python
no_duplicates = list(set(my_list))
  1. Calculate the Length of a String without Using len():
python
length = sum(1 for _ in 'Hello World')
  1. Check if a List Contains All Elements of Another List:
python
contains_all = all(elem in list1 for elem in list2)
  1. Generate a String of Random Characters:
python
import random; 
random_str = ''.join(random.choices('abcdefghijklmnopqrstuvwxyz', k=10))
  1. Convert a List of Integers to a Single Number:
python
num = int(''.join(map(str, [1, 2, 3, 4, 5])))
  1. Palindromic Check:
python
is_palindrome = lambda s: s == s[::-1]
  1. List Flattening:
python
flatten_list = sum([[1, 2], [3, 4]], [])
  1. Find the Most Frequent Element in a List:
python
most_frequent = max(set(my_list), key=my_list.count)
  1. Merge Two Dictionaries:
python
merged_dict = {**dict1, **dict2}

If you have feedback, leave a comment below, or send me an email. I’d love to see your favorite Python one-liners too.

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