[Python-ideas] Add a context manager to keep stream position unchanged

[Dmitry Kazakov]

If the final resolution is "we don't need this in the library", that's fine
- I agree that the proposal is trivial and doesn't gain much. OTOH the
contextlib.closing can also be said to be a simple exercise, because its
implementation is 22 lines long and it's equivalent to

@contextmanager
def closing(thing):
    try:
        yield thing
    finally:
        thing.close()

(from the docs)
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