What are some examples of Python Lambda functions?

What are some examples of Python Lambda functions?

Python Lambda functions are small anonymous functions defined with the lambda keyword. Here are a few examples:

1. Basic Addition: add = lambda x, y: x + y
2. Square a Number: square = lambda x: x ** 2
3. Filter Even Numbers: even_numbers = list(filter(lambda x: x % 2 == 0, range(10)))
4. Sort by Second Element: sorted_list = sorted([(1, 'one'), (2, 'two'), (3, 'three')], key=lambda x: x[1])

Would you like to see more examples or explanations?

Can you explain the filter example in detail?

Sure! The filter function in Python is used to filter elements from an iterable based on a function that returns True or False. In the example even_numbers = list(filter(lambda x: x % 2 == 0, range(10))), the lambda function checks if a number is even. The filter function applies this lambda to each number in the range from 0 to 9, returning only the even numbers. The result is then converted to a list.

What are the advantages of using Lambda functions?

Lambda functions are concise and can be defined in a single line, making them useful for short operations. They are often used in higher-order functions like map, filter, and reduce, allowing for cleaner and more readable code. However, they are limited to a single expression and can be less readable if overused.

Can you give me a real-world application of Lambda functions?

Certainly! A real-world application of Lambda functions is in data processing tasks, such as transforming data in a DataFrame using libraries like Pandas. For example, you can use a lambda function to apply a transformation to a column of data, like normalizing values or calculating new metrics based on existing ones.