How to Write Lambda Function Quickly in Python: 5 Examples

Here are the top python lambda function examples for your project and interviews. "Python's lambda functions are a powerful way to create small, anonymous functions on the fly. In this post, we'll explore some examples of how to use lambda functions in Python.

5 Best Python Lambda Function Examples

#1 Sorting a List of Tuples by the Second Element

This lambda function sorts a list of tuples based on the second element of each tuple.

python code

my_list = [(1, 2), (4, 1), (9, 10), (13, 6), (5, 7)]

sorted_list = sorted(my_list, key=lambda x: x[1])

print(sorted_list)

Output:

[(4, 1), (1, 2), (13, 6), (5, 7), (9, 10)]

** Process exited - Return Code: 0 **

Press Enter to exit terminal

#2 Finding the Maximum Value in a List of Dictionaries

This lambda function finds the maximum value in a list of dictionaries based on a specific key.

python code

my_list = [{'name': 'Alice', 'age': 25}, {'name': 'Bob', 'age': 30}, {'name': 'Charlie', 'age': 20}]

max_age = max(my_list, key=lambda x: x['age'])

print(max_age)

Output:

{'name': 'Bob', 'age': 30}

** Process exited - Return Code: 0 **

Press Enter to exit terminal

#3 Multiplying Two Lists Element-Wise

This lambda function multiplies two lists element-wise and returns the result as a new list.

python code

list1 = [1, 2, 3, 4]

list2 = [5, 6, 7, 8]

result = list(map(lambda x, y: x * y, list1, list2))

print(result)

Output:

[5, 12, 21, 32]

** Process exited - Return Code: 0 **

Press Enter to exit terminal

#4 Filtering a List of Integers

This lambda function filters a list of integers and returns only the even numbers.

python code

my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

even_numbers = list(filter(lambda x: x % 2 == 0, my_list))

print(even_numbers)

Output:

[2, 4, 6, 8, 10]

** Process exited - Return Code: 0 **

Press Enter to exit terminal

#5 Creating a Function That Returns a Function

This lambda function creates a function that returns another function that adds a constant value to its input.

python code

def add_constant(const):

    return lambda x: x + const

add5 = add_constant(5)

add10 = add_constant(10)

print(add5(3))

print(add10(3))

Output:

8

13

** Process exited - Return Code: 0 **

Press Enter to exit terminal

In the above example, add_constant is a function that returns a lambda function that adds the constant value to its input. add5 and add10 are two different functions that add 5 and 10 to their input, respectively.

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