[compat] Introduce compat_etree_Element

Author: dstftw

test/test_compat.py

@@ -13,6 +13,7 @@
 from youtube_dl.compat import (
     compat_getenv,
     compat_setenv,
+    compat_etree_Element,
     compat_etree_fromstring,
     compat_expanduser,
     compat_shlex_split,
@@ -90,6 +91,12 @@ def test_compat_shlex_split(self):
         self.assertEqual(compat_shlex_split('-option "one\ntwo" \n -flag'), ['-option', 'one\ntwo', '-flag'])
         self.assertEqual(compat_shlex_split('-val 中文'), ['-val', '中文'])
 
+    def test_compat_etree_Element(self):
+        try:
+            compat_etree_Element.text
+        except AttributeError:
+            self.fail('compat_etree_Element is not a type')
+
     def test_compat_etree_fromstring(self):
         xml = '''
             <root foo="bar" spam="中文">

youtube_dl/compat.py

@@ -2508,6 +2508,15 @@ def doctype(self, name, pubid, system):
         pass
 
 
+try:
+    # xml.etree.ElementTree.Element is a method in Python <=2.6 and
+    # the following will crash with:
+    #  TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and types
+    isinstance(None, xml.etree.ElementTree.Element)
+    from xml.etree.ElementTree import Element as compat_etree_Element
+except TypeError:  # Python <=2.6
+    from xml.etree.ElementTree import _ElementInterface as compat_etree_Element
+
 if sys.version_info[0] >= 3:
     def compat_etree_fromstring(text):
         return etree.XML(text, parser=etree.XMLParser(target=_TreeBuilder()))
@@ -2969,6 +2978,7 @@ def compat_ctypes_WINFUNCTYPE(*args, **kwargs):
     'compat_cookiejar',
     'compat_cookies',
     'compat_ctypes_WINFUNCTYPE',
+    'compat_etree_Element',
     'compat_etree_fromstring',
     'compat_etree_register_namespace',
     'compat_expanduser',