Wolfgang Maier added the comment: You are probably right that the io classes are broken.
>From https://docs.python.org/3/library/stdtypes.html#iterator-types: Once an iterator’s __next__() method raises StopIteration, it must continue to do so on subsequent calls. Implementations that do not obey this property are deemed broken. One consequence of __iter__ returning self is that the above is not guaranteed: >>> with open('somefile', 'w') as f: f.write('some text') 9 >>> with open('somefile', 'r') as f: i = iter(f) assert f is i for line in i: print(line) try: next(i) except StopIteration: print('exhausted iterator') f.seek(0) print(next(i)) some text exhausted iterator 0 some text So the io classes are *officially* broken. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue23700> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
