versioning.py 文件源码

def get_ratio(old, new):
    """Return a "similiarity ratio" (in percent) representing the similarity
    between the two strings where 0 is equal and anything above less than equal.
    """
    if not all([old, new]):
        return VERSIONING_RATIO

    if IS_SPEEDUP:
        return Levenshtein.distance(old, new) / (len(old) / 100.0)
    else:
        return levenshtein_distance(old, new) / (len(old) / 100.0)