The yield keyword is used in Python to create generators, which are a type of iterator that can be used to iterate over a sequence of values. A generator function is defined like a regular function, but it uses the yield keyword to return a value instead of the return keyword.

        The primary purpose of the yield keyword is to allow a function to return a value, and then resume execution from where it left off the next time it is called. This makes it possible to create a function that generates a sequence of values on the fly, rather than generating all of the values at once and storing them in memory.

        Here's an example of a generator function that uses the yield keyword:

def generate_numbers(n):
    for i in range(n):
        yield i

numbers = generate_numbers(5)

for number in numbers:
    print(number)

        In this example, we define a generator function called generate_numbers that generates the numbers from 0 to n-1. Instead of using the return keyword to return a list of numbers, we use the yield keyword to generate each number one at a time.

        When we call the generate_numbers function with an argument of 5, it returns a generator object. We can then use a for loop to iterate over the generator and print each number.

        The output of this code will be:

0
1
2
3
4

        In summary, the yield keyword is used in Python to create generator functions that generate a sequence of values on the fly. The yield keyword is used to return a value from the generator function, and then pause execution until the next value is requested. This makes it possible to generate large sequences of values without using a lot of memory.