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indicate that 'b' is added to the mode flag if not given
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@ -41,8 +41,8 @@ The \var{mode} argument can be any of \code{'r'}, \code{'rb'},
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\code{'a'}, \code{'ab'}, \code{'w'}, or \code{'wb'}, depending on
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whether the file will be read or written. The default is the mode of
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\var{fileobj} if discernible; otherwise, the default is \code{'rb'}.
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Be aware that only the \code{'rb'}, \code{'ab'}, and \code{'wb'}
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values should be used for cross-platform portability.
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If not given, the 'b' flag will be added to the mode to ensure the
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file is opened in binary mode for cross-platform portability.
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The \var{compresslevel} argument is an integer from \code{1} to
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\code{9} controlling the level of compression; \code{1} is fastest and
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