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returned as bytes, and data to be written should be given as bytes.
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mode can be 'r' for reading (default), 'w' for (over)writing,
'x' for creating exclusively, or 'a' for appending. These can
equivalently be given as 'rb', 'wb', 'xb', and 'ab'.
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compression, and 9 (default) produces the most compression.
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