How do I use map and filter in Python?

How do I use map and filter in Python?

In Python, map() applies a function to all items in an iterable, while filter() filters items based on a condition. Would you like an example?

Yes, please provide an example using a list of numbers.

Sure! Here's an example:

numbers = [1, 2, 3, 4, 5]

# Using map to square the numbers
squared = list(map(lambda x: x**2, numbers))

# Using filter to get even numbers
evens = list(filter(lambda x: x % 2 == 0, numbers))

print(squared)  # Output: [1, 4, 9, 16, 25]
print(evens)    # Output: [2, 4]

What if I want to use a named function instead of a lambda?

You can define a named function and pass it to map() or filter(). For example:

def square(x):
    return x**2

squared = list(map(square, numbers))