What methods of creating generators do you know in Python?

In Python, generators can be created in two main ways:

1. Using the yield keyword in a function — a function with yield returns a generator that can be iterated over.

def count_up_to(n):
    count = 1
    while count <= n:
        yield count
        count += 1

for number in count_up_to(5):
    print(number)

2. Generator expressions — similar to list comprehensions, but return a generator instead of a list.

squares = (x*x for x in range(5))
for square in squares:
    print(square)

Both methods allow for lazy generation of sequences, saving memory.