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When set to a value other than ``None``, this variable defines the prefix of the
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final component of the filenames returned by :func:`mktemp`. A string of six
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random letters and digits is appended to the prefix to make the filename unique.
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Older versions of this module used to require that ``template`` be set to
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``None`` after a call to :func:`os.fork`; this has not been necessary since