[Python] iterator and iterable classes in python [closed]

[enter image description here][1]Why do we return self in the iter method when we define the next method in the iterable and iterator classes?

This topic was taught in the course, but it was hard to understand and I didn't understand why we had to return self.

class PowTwo:
def __init__(self, max_pow):
self.n = 0
self.max_pow = max_pow

def __iter__(self):
return self

def __next__(self):
if self.n <= self.max_pow:
result = self.n ** 2
self.n += 1
return result
else:
raise StopIteration
n = PowTwo(5)
for i in n:
print(i)

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