Issue 3314. The sys module is used in an error case.

Lib/test/test_urlparse.py

@@ -310,6 +310,10 @@ class UrlParseTestCase(unittest.TestCase):
         self.assertEqual(urllib.parse.urlparse("http://example.com?blahblah=/foo"),
                          ('http', 'example.com', '', '', 'blahblah=/foo', ''))
 
+    def test_usingsys(self):
+        # Issue 3314: sys module is used in the error
+        self.assertRaises(TypeError, urllib.parse.urlencode, "foo")
+
 def test_main():
     support.run_unittest(UrlParseTestCase)
 

Lib/urllib/parse.py

@@ -4,6 +4,8 @@ See RFC 1808: "Relative Uniform Resource Locators", by R. Fielding,
 UC Irvine, June 1995.
 """
 
+import sys
+
 __all__ = ["urlparse", "urlunparse", "urljoin", "urldefrag",
            "urlsplit", "urlunsplit"]
 
@@ -599,7 +601,6 @@ test_input = """
 """
 
 def test():
-    import sys
     base = ''
     if sys.argv[1:]:
         fn = sys.argv[1]