Generators

def my_generator():
    yield 1
    yield 2
    yield 3

# Using the generator function
gen = my_generator()
print(next(gen))  # Output: 1
print(next(gen))  # Output: 2
print(next(gen))  # Output: 3

def countdown(n):
    while n > 0:
        yield n
        n -= 1

# Using the generator in a for loop
for num in countdown(5):
    print(num)  # Output: 5 4 3 2 1