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or "rt", "wt" or "at" for text mode. The default mode is "rb", and the
default compresslevel is 9.
For binary mode, this function is equivalent to the GzipFile constructor:
GzipFile(filename, mode, compresslevel). In this case, the encoding, errors
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io.TextIOWrapper instance with the specified encoding, error handling
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A mode of 'r' is equivalent to one of 'rb', and similarly for 'w' and
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