What are some examples of using lambda functions in Python?

What are some examples of using lambda functions in Python?

Lambda functions in Python are small anonymous functions defined with the keyword 'lambda'. They can take any number of arguments but can only have one expression. For example, you can use a lambda function to square a number: square = lambda x: x ** 2.

Can you show me how to use lambda with the map function?

Sure! You can use a lambda function with the map function to apply it to each item in a list. For example: numbers = [1, 2, 3, 4] and squared = list(map(lambda x: x ** 2, numbers)) will give you [1, 4, 9, 16].

What about using lambda with filter?

Great question! You can use filter with a lambda function to filter items in a list. For example: evens = list(filter(lambda x: x % 2 == 0, numbers)) will return [2, 4] from the numbers list.

Can you give an example of using lambda with sorting?

Absolutely! You can use a lambda function as the key in the sorted function. For instance, if you have a list of tuples like data = [(1, 'one'), (3, 'three'), (2, 'two')], you can sort it by the second element with sorted(data, key=lambda x: x[1]), which will give you [(1, 'one'), (3, 'three'), (2, 'two')].