helpers.py 文件源码

def reparent(newparent, oldpath):
    '''when copying or moving a directory structure, you need to re-parent the
    oldpath.  When using os.path.join to calculate this new path, the
    appearance of a / root path at the beginning of oldpath, supplants the
    newparent and we don't want this to happen, so we need to make the oldpath
    root appear as a child of the newparent.

    :param: str newparent: the new parent location for oldpath (target)
    :param str oldpath: the path being adopted by newparent (source)

    :returns: (str) resulting adoptive path
    '''

    if oldpath[0] in (posixpath.sep, ntpath.sep):
        oldpath = '.' + oldpath
    return os.path.join(newparent, oldpath)