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bzrlib/tuned_gzip.py
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        # (4 seconds to 1 seconds for the sample upgrades I was testing).
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        self.write(''.join(lines))
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    if sys.version_info > (2, 7):
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        # As of Python 2.7 the crc32 must be positive when close is called
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        def close(self):
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            if self.fileobj is None:
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                return
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            if self.mode == gzip.WRITE:
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                self.crc &= 0xFFFFFFFFL
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            gzip.GzipFile.close(self)
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