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Home Interviews What are list comprehensions in Python? – MindStick
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ICSM Computer
ICSM Computer 27 Mar 2025
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List Comprehensions in Python

A list comprehension is a concise way to create lists in Python using a single line of code. It provides a more readable and efficient way to generate lists compared to traditional for loops.

Basic Syntax

[expression for item in iterable if condition]
  1. expression → The operation performed on each item.
  2. item → Each element from the iterable (e.g., a list or range).
  3. iterable → The sequence being iterated over.
  4. if condition (optional) → A filter to include only certain elements.

Examples

Creating a list from Range

numbers = [x for x in range(5)]
print(numbers)

[0, 1, 2, 3, 4]

Squaring Each Element

squares = [x**2 for x in range(5)]
print(squares)

[0, 1, 4, 9, 16]

Filtering Elements

evens = [x for x in range(10) if x % 2 == 0]
print(evens)

[0, 2, 4, 6, 8]

Using List Comprehension with Strings

words = ["apple", "banana", "cherry"]
uppercase_words = [word.upper() for word in words]
print(uppercase_words)

['APPLE', 'BANANA', 'CHERRY']

Nested List Comprehension (Flattening a List)

matrix = [[1, 2, 3], [4, 5, 6]]
flattened = [num for row in matrix for num in row]
print(flattened)

[1, 2, 3, 4, 5, 6]

Advantages of List Comprehensions

  1. More concise than for loops
  2. More readable (for simple cases)
  3. Faster execution compared to traditional loops

When to Avoid List Comprehensions?

  1. If the expression is too complex, it can reduce readability
  2. If multiple conditions are involved, using a regular loop might be clearer
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