{"id":77,"date":"2026-03-01T17:02:12","date_gmt":"2026-03-01T12:02:12","guid":{"rendered":"https:\/\/gigz.pk\/python\/?post_type=lesson&p=77"},"modified":"2026-03-13T13:00:31","modified_gmt":"2026-03-13T08:00:31","slug":"list-comprehension","status":"publish","type":"lesson","link":"https:\/\/gigz.pk\/python\/lesson\/list-comprehension\/","title":{"rendered":"List Comprehension"},"content":{"rendered":"\n

List comprehension<\/strong> is a short and powerful way to create lists in Python.
It allows you to generate a new list by writing a single line of code instead of using multiple lines with a loop.<\/p>\n\n\n\n

It makes your code cleaner, shorter, and more readable.<\/p>\n\n\n\n

BASIC SYNTAX<\/strong><\/h1>\n\n\n\n
[expression for item in iterable]<\/pre>\n\n\n\n
\u2022 expression<\/code> \u2192 What you want to store in the list
\u2022 item<\/code> \u2192 Variable representing each element
\u2022 iterable<\/code> \u2192 Sequence like list, range, string, etc.<\/p>\n\n\n\n
EXAMPLE 1: SIMPLE LIST CREATION<\/strong><\/h1>\n\n\n\n
Using normal loop:<\/p>\n\n\n\n
squares = []
for x in range(5):
    squares.append(x * x)print(squares)<\/pre>\n\n\n\n
Using list comprehension:<\/p>\n\n\n\n
squares = [x * x for x in range(5)]
print(squares)<\/pre>\n\n\n\n
Both give the same result.<\/p>\n\n\n\n
LIST COMPREHENSION WITH CONDITION<\/strong><\/h1>\n\n\n\n
You can add an if<\/code> condition.<\/p>\n\n\n\n
even_numbers = [x for x in range(10) if x % 2 == 0]
print(even_numbers)<\/pre>\n\n\n\n
This creates a list of even numbers.<\/p>\n\n\n\n
USING IF-ELSE IN LIST COMPREHENSION<\/strong><\/h1>\n\n\n\n
result = [\"Even\" if x % 2 == 0 else \"Odd\" for x in range(5)]
print(result)<\/pre>\n\n\n\n
This checks each number and labels it as Even or Odd.<\/p>\n\n\n\n
LIST COMPREHENSION WITH STRINGS<\/strong><\/h1>\n\n\n\n
word = \"Python\"
letters = [letter for letter in word]
print(letters)<\/pre>\n\n\n\n
NESTED LIST COMPREHENSION<\/strong><\/h1>\n\n\n\n
matrix = [[j for j in range(3)] for i in range(3)]
print(matrix)<\/pre>\n\n\n\n
This creates a 3\u00d73 matrix.<\/p>\n\n\n\n
WHY USE LIST COMPREHENSION<\/strong><\/h1>\n\n\n\n
\u2022 Makes code shorter
\u2022 Improves readability
\u2022 Faster than traditional loops in many cases
\u2022 Easy to apply conditions<\/p>\n\n\n\n
IMPORTANT POINTS<\/strong><\/h1>\n\n\n\n
\u2022 Keep it simple for readability
\u2022 Avoid very complex nested comprehensions
\u2022 Useful for transforming and filtering data<\/p>\n\n\n\n
Understanding list comprehension<\/strong> helps you write efficient and professional Python code.<\/p>\n\n\n
Home<\/a><\/span> \u00bb PYTHON INTERMEDIATE (PYI) > Data Structures > List Comprehension<\/span><\/span><\/div>\n\n\n
<\/strong> 
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