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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def gettempdir():
 """Accessor for tempfile.tempdir."""

    global tempdir
    if tempdir is None:
        _once_lock.acquire()
        try:
            if tempdir is None:
                tempdir = _get_default_tempdir()
        finally:
            _once_lock.release()
    return tempdir