PY3.E0301

Non-iterator returned

Used when an iter method returns something which is not an iterable (i.e. has no next method).

Noncompliant Code:

Copy
class Iterator:
    def __init__(self, end, start=0):
        self.n = start
        self.end = end

    def __iter__(self):
        return self

Compliant Code:

Copy
class Iterator:
    def __init__(self, end, start=0):
        self.n = start
        self.end = end

    def __iter__(self):
        return self

    def __next__(self):
        if self.n <= self.end:
            n = self.n
            self.n += 1
            return n

        raise StopIteration

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