File CVE-2019-10160-netloc-port-regression.patch of Package python.11982

--- a/Lib/test/test_urlparse.py
+++ b/Lib/test/test_urlparse.py
@@ -642,12 +642,12 @@ class UrlParseTestCase(unittest.TestCase
         self.assertIn(u'\uFF03', denorm_chars)
 
         for scheme in [u"http", u"https", u"ftp"]:
-            for c in denorm_chars:
-                url = u"{}://netloc{}false.netloc/path".format(scheme, c)
-                if test_support.verbose:
-                    print "Checking %r" % url
-                with self.assertRaises(ValueError):
-                    urlparse.urlsplit(url)
+            for netloc in [u"netloc{0}false.netloc", u"n{0}user@netloc"]:
+                for c in denorm_chars:
+                    url = u"{0}://{1}/path".format(scheme, netloc.format(c))
+                    if test_support.verbose:
+                        print("Checking %r" % url)
+                    self.assertRaises(ValueError, urlparse.urlsplit, url)
 
 def test_main():
     test_support.run_unittest(UrlParseTestCase)
--- a/Lib/urlparse.py
+++ b/Lib/urlparse.py
@@ -171,13 +171,16 @@ def _checknetloc(netloc):
     # looking for characters like \u2100 that expand to 'a/c'
     # IDNA uses NFKC equivalence, so normalize for this check
     import unicodedata
-    netloc2 = unicodedata.normalize('NFKC', netloc)
-    if netloc == netloc2:
+    n = netloc.replace('@', '')   # ignore characters already included
+    n = n.replace(':', '')        # but not the surrounding text
+    n = n.replace('#', '')
+    n = n.replace('?', '')
+    netloc2 = unicodedata.normalize('NFKC', n)
+    if n == netloc2:
         return
-    _, _, netloc = netloc.rpartition('@') # anything to the left of '@' is okay
     for c in '/?#@:':
         if c in netloc2:
-            raise ValueError("netloc '" + netloc2 + "' contains invalid " +
+            raise ValueError("netloc '" + netloc + "' contains invalid " +
                              "characters under NFKC normalization")
 
 def urlsplit(url, scheme='', allow_fragments=True):