test_xml_etree.py 文件源码

def path_cache():
    """
    Check that the path cache behaves sanely.

    >>> elem = ET.XML(SAMPLE_XML)
    >>> for i in range(10): ET.ElementTree(elem).find('./'+str(i))
    >>> cache_len_10 = len(ET.ElementPath._cache)
    >>> for i in range(10): ET.ElementTree(elem).find('./'+str(i))
    >>> len(ET.ElementPath._cache) == cache_len_10
    True
    >>> for i in range(20): ET.ElementTree(elem).find('./'+str(i))
    >>> len(ET.ElementPath._cache) > cache_len_10
    True
    >>> for i in range(600): ET.ElementTree(elem).find('./'+str(i))
    >>> len(ET.ElementPath._cache) < 500
    True
    """