[issue7471] GZipFile.readline too slow

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Two things:
- since it implements common IO operations, the GzipFile class could
inherit io.BufferedIOBase. It would also alleviate the need to
reimplement readinto(): BufferedIOBase has a default implementation
which should be sufficient.
- rather than `type(data) is memoryview`, the preferred idiom is
`isinstance(data, memoryview)`.

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<http://bugs.python.org/issue7471>
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