Python Lambda Functions - A Beginner's Guide

Lambda Functions in Python

Python lambda functions are small, anonymous functions that can be used to perform simple tasks. They are often used in conjunction with other Python functions, such as the map() and filter() functions.

To create a lambda function, you use the lambda keyword followed by a list of parameters and a body expression. The body expression is a single expression that evaluates to a value.

For example, the following lambda function returns the maximum value in a list:

lambda list: max(list)

This lambda function takes a list as its only parameter and returns the maximum value in the list.

Lambda functions are often used to simplify code. For example, the following code can be written using a lambda function:

def max_value(list):
return max(list)

numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
max_value = max_value(numbers)
print(max_value)

This code can be rewritten as follows:

numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
max_value = lambda list: max(list)
max_value = max_value(numbers)
print(max_value)

The second version of the code is shorter and easier to read. It also uses a lambda function, which is more efficient than creating a named function.

Lambda functions can be used in a variety of ways. They can be used to filter lists, to map values to new values, and perform other simple tasks. They are a powerful tool that can be used to simplify your Python code.

Lambda Function with map() in Python

Here is a brief explanation of how to use lambda functions with the map() function in Python:

The map() the function takes two arguments: a lambda function and a list. The lambda function is used to map the values in the list to new values, and the new list is returned.

For example, the following code maps a list of strings to their lengths:

strings = ['hello', 'world', 'python']
lengths = map(lambda string: len(string), strings)
print(list(lengths))

This code will print the following output:

[5, 5, 6]