What is list comprehension in Python?

[shreyiot]

List comprehension in Python is a concise way to create lists using a single line of code. It enhances readability and reduces the need for traditional for loops, making the code more efficient and Pythonic.

Syntax of List Comprehension:​

The general syntax for list comprehension is:


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new_list = [expression for item in iterable if condition]

• expression: The operation to be performed on each element.
• item: The element taken from the iterable.
• iterable: The source from which elements are extracted (like a list, tuple, or range).
• condition (optional): A filtering criterion to include only specific elements.

Example 1: Creating a List of Squares​

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squares = [x**2 for x in range(1, 6)]
print(squares)


Output: [1, 4, 9, 16, 25]

Example 2: Filtering Even Numbers​

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


Output: [0, 2, 4, 6, 8]

Example 3: Transforming Strings​

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words = ["hello", "world", "python"]
uppercase_words = [word.upper() for word in words]
print(uppercase_words)


Output: ['HELLO', 'WORLD', 'PYTHON']

Advantages of List Comprehension​

• Concise & Readable: Reduces multiple lines of code into one.
• Faster Execution: More efficient than traditional loops.
• Memory Efficient: Works well with generators and large datasets.

List comprehension is a powerful feature that every Python programmer should master. If you want to learn Python from scratch, consider Python training in Noida to build strong programming skills.