wordnet.py 文件源码

def _index(key, sequence, testfn=None, keyfn=None):
    """Return the index of key within sequence, using testfn for
    comparison and transforming items of sequence by keyfn first.

    >>> _index('e', 'hello')
    1
    >>> _index('E', 'hello', testfn=_equalsIgnoreCase)
    1
    >>> _index('x', 'hello')
    """
    index = 0
    for element in sequence:
    value = element
    if keyfn:
        value = keyfn(value)
    if (not testfn and value == key) or (testfn and testfn(value, key)):
        return index
    index = index + 1
    return None