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    In Python, a lambda function is a small, anonymous function defined using the lambda keyword. It can take any number of arguments but is restricted to a single expression, whose result is returned automatically. Unlike functions created with def, lambdas are typically used for short, throwaway operations.

    Basic syntax:

    lambda arguments: expression
    Gekopieerd.

    Example:

    square = lambda x: x ** 2
    print(square(5)) # Output: 25
    Gekopieerd.

    Here, square is a lambda that returns the square of its input.

    Common Use Cases:

    • Inline Conditional Logic

    check = lambda x: "Positive" if x > 0 else "Negative" if x < 0 else "Zero"
    print(check(-3)) # Output: Negative
    Gekopieerd.

    • With map() for transformations

    nums = [1, 2, 3, 4]
    doubled = list(map(lambda x: x * 2, nums))
    print(doubled) # Output: [2, 4, 6, 8]
    Gekopieerd.

    • With filter() for selection

    nums = [1, 2, 3, 4, 5, 6]
    evens = list(filter(lambda x: x % 2 == 0, nums))
    print(evens) # Output: [2, 4, 6]
    Gekopieerd.

    • With reduce() for aggregation

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  2. Real Python
    https://realpython.com › python-lambdaDit resultaat vertalen

    How to Use Python Lambda Functions – Real Python

    In this step-by-step tutorial, you'll learn about Python lambda functions. You'll see how they compare with regular functions and how you can use them in …

  3. W3School
    https://www.w3schools.com › python › python_lambda.aspDit resultaat vertalen

    Python Lambda - W3Schools

    Lambda Functions A lambda function is a small anonymous function. A lambda function can take any number of arguments, but can only have one expression.

    Codevoorbeeld

    # Add 10 to argument a, and return the result
    x = lambda a : a + 10
    print(x(5))

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  5. PyTutorial
    https://pytutorial.com › python-lambda-functions-guide-examplesDit resultaat vertalen

    Python Lambda Functions Guide & Examples - PyTutorial

    2 feb. 2026 · Learn how to use Python lambda functions for concise, anonymous operations. This guide covers syntax, use cases with map, filter, sort, and key differences from def.

  6. Programiz
    https://www.programiz.com › python-programming › anonymou…Dit resultaat vertalen

    Python Lambda/ Function (With Examples) - Programiz

    Learn how to create and use lambda functions in Python, which are special functions without names. See examples of lambda functions with and without arguments, and ho…

    We use the lambda keyword instead of defto create a lambda function. Here's the syntax to declare the lambda function: Here, 1. argument(s)- any value passed to the lambda function 2. expression- expression is executed and returned Let's see an example, Here…
    Meer bekijken op programiz.com
  7. Pythonista Planet
    https://pythonistaplanet.com › python-lambda-fu…Dit resultaat vertalen

    10 Python Lambda Functions Exercises and Examples

    I hope these exercises and examples give you a better understanding of lambda functions in Python. Check out my post on 15 Python Object-Oriented …

  8. Python Guides
    https://pythonguides.com › use-lambda-function…Dit resultaat vertalen

    How To Use Lambda Functions In Python?

    10 feb. 2025 · Learn how to use lambda functions in Python for short, anonymous functions with `map ()`, `filter ()`, and `sorted ()`. This step-by-step guide includes …

  9. Stack Overflow
    https://stackoverflow.com › questionsDit resultaat vertalen

    What is `lambda` in Python code? How does it work with `key` …

    Your example contains "lambda" because python has a nifty lambda keyword for defining such functions on the fly. Instead of defining a function compare_person and passing that to sorted, you can also write:

  10. TechBloat
    https://www.techbloat.com › how-to-use-lambda-functions-in-pyth…Dit resultaat vertalen

    How To Use Lambda Functions in Python [With Examples]

    4 jul. 2025 · One of the most powerful, yet often misunderstood features of Python is the lambda function. In this comprehensive guide, we’ll explore what lambda functions are, how and when to use …

  11. Geekflare
    https://geekflare.com › dev › lambda-functions-p…Dit resultaat vertalen

    How To Use Lambda Functions in Python [With …

    29 dec. 2024 · In this guide, you’ll learn all about lambda functions in Python - from syntax to the use cases for lambda functions - with examples.

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