Generator, simply, this is a function that returns the iterator. It's applicable in case of when you do not need to load all data in memory before processing or in cases when we can not receive all data at once or we generate it on the go. In some languages mainly used special keyword yield what returns some value until the next call of the next value from the iterator.

Let’s create the generator.

def gen(steps):
	for i in range(0, steps):
		yield i * i

The yield will generate something like this
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