test_xml_etree.py 文件源码

def __enter__(self):
        from xml.etree import ElementTree
        self._nsmap = ElementTree._namespace_map
        self._path_cache = ElementTree.ElementPath._cache
        # Copy the default namespace mapping
        ElementTree._namespace_map = self._nsmap.copy()
        # Copy the path cache (should be empty)
        ElementTree.ElementPath._cache = self._path_cache.copy()
        self.checkwarnings.__enter__()