Introduction to Lambda Expressions

Lambda expressions in Python are anonymous functions, which means that they are functions without a name. Instead, they are defined using the "lambda" keyword, followed by the function's input parameters and the function's output value. Lambda expressions can take any number of arguments but can only have one expression.

Lambda Syntax

The syntax for Lambda expressions in Python is as follows:

lambda arguments: expression

Where "arguments" represent the input parameters of the function, and "expression" is the output value of the function.

Examples of Lambda Expressions

Here are some examples of Lambda expressions:

# Adding two numbers using Lambda
sum = lambda x, y: x + y
print(sum(10, 20)) # Output: 30

# Finding the square of a number using Lambda
square = lambda x: x ** 2
print(square(5)) # Output: 25

# Sorting a list of numbers using Lambda
numbers = [4, 1, 3, 6, 7, 2]
sorted_numbers = sorted(numbers, key=lambda x: x)
print(sorted_numbers) # Output: [1, 2, 3, 4, 6, 7]

Benefits of Lambda Expressions

Lambda expressions offer several benefits when it comes to programming in Python. Here are a few:

  • Conciseness: Lambda expressions allow us to write more concise code as we don't have to define a separate function for a small piece of code.
  • Readability: Lambda expressions make code more readable by reducing the number of lines required for a particular function.
  • Flexibility: Lambda expressions are flexible and can be used in a variety of contexts such as sorting, filtering, and mapping.


Lambda expressions in Python are a powerful feature that offers flexibility, conciseness, and improved code readability. By using Lambda expressions, you can write more concise code that is easier to read and maintain. We hope this article has given you a better understanding of Lambda expressions and their applications in Python.

Mermaid diagram of Lambda Expression Syntax

			graph LR
A[lambda keyword] -- inputs --> B[arguments]
B --> C[expression]
C -- output --> D[anonymous function]

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