Fix URL parsing with Python 3.9, 3.8.1, and 3.7.6

Author: asvetlov

CHANGES/409.bugfix

@@ -0,0 +1 @@
+Fix tests with newer Python (3.7.6, 3.8.1 and 3.9.0+).

tests/test_url_parsing.py

@@ -40,9 +40,19 @@ def test_scheme_only(self):
 
     def test_no_scheme1(self):
         u = URL("google.com:80")
-        assert u.scheme == ""
-        assert u.host is None
-        assert u.path == "google.com:80"
+        # See: https://bugs.python.org/issue27657
+        if (
+            sys.version_info[:3] == (3, 7, 6)
+            or sys.version_info[:3] == (3, 8, 1)
+            or sys.version_info >= (3, 9, 0)
+        ):
+            assert u.scheme == "google.com"
+            assert u.host is None
+            assert u.path == "80"
+        else:
+            assert u.scheme == ""
+            assert u.host is None
+            assert u.path == "google.com:80"
         assert u.query_string == ""
         assert u.fragment == ""