Can you explain filter and reduce in Python?

Can you explain filter and reduce in Python?

Sure! In Python, filter is used to filter elements from an iterable based on a function that returns True or False.

How does the filter function work with an example?

For example, if you have a list of numbers and want to filter out even numbers, you can use filter(lambda x: x % 2 != 0, numbers).

What about the reduce function?

reduce is used to apply a rolling computation to sequential pairs of values in an iterable. For example, reduce(lambda x, y: x + y, numbers) sums up all the numbers.

Can you show me a complete example with both filter and reduce?

Absolutely! Here's a complete example:

from functools import reduce

numbers = [1, 2, 3, 4, 5, 6]
filtered = list(filter(lambda x: x % 2 != 0, numbers))
result = reduce(lambda x, y: x + y, filtered)
print(result)  # Output will be 9 (1 + 3 + 5)