Class IntsFrom

Lib/test/test_iter.py:656–666

        # Generate all ints starting at constructor arg.
        class IntsFrom:
            def __init__(self, start):
                self.i = start

            def __iter__(self):
                return self

            def __next__(self):
                i = self.i
                self.i = i+1
                return i

        f = open(TESTFN, "w", encoding="utf-8")
        try: