tempdir.py 文件源码

def default():
    """
    Obtain the global default instance of TemporaryDirectory, creating
    it first if necessary. Failures are propagated to caller. Most
    callers are expected to use this function rather than
    instantiating TemporaryDirectory directly, unless they explicitly
    desdire to have their "own" directory for some reason.

    This function is thread-safe.
    """
    global _defaultLock
    global _defaultInstance

    _defaultLock.acquire()
    try:
        if _defaultInstance is None or _defaultInstance.dir() is None:
            _defaultInstance = TemporaryDirectory(temproot=globals.temproot)
            # set the temp dir to be the default in tempfile module from now on
            tempfile.tempdir = _defaultInstance.dir()
        return _defaultInstance
    finally:
        _defaultLock.release()