gh-159675: Tidy and lazify imports in xml.sax.saxutils (#159676)

Co-authored-by: Stan Ulbrych <stan@python.org>

Author: jelly

Lib/test/test_sax.py

@@ -24,8 +24,8 @@
 import sys
 from urllib.error import URLError
 import urllib.request
-from test.support import os_helper
-from test.support import findfile, check__all__
+from test.support import (check__all__, cpython_only, findfile,
+                          import_helper, os_helper)
 from test.support.os_helper import FakePath, TESTFN
 
 
@@ -1600,6 +1600,12 @@ def test_deprecated__version__and__date__(self):
                     getattr(module, "version")
                 self.assertEqual(cm.filename, __file__)
 
+    @cpython_only
+    def test_lazy_import(self):
+        import_helper.ensure_lazy_imports(
+            "xml.sax.saxutils", {"urllib.parse", "urllib.request"}
+        )
+
 
 if __name__ == "__main__":
     unittest.main()

Lib/xml/sax/saxutils.py

@@ -3,9 +3,12 @@
 convenience of application and driver writers.
 """
 
-import os, urllib.parse, urllib.request
-import io
 import codecs
+import io
+import os
+import sys
+lazy import urllib.parse
+lazy import urllib.request
 from . import handler
 from . import xmlreader
 
@@ -70,7 +73,6 @@ def quoteattr(data, entities={}):
 
 def _gettextwriter(out, encoding):
     if out is None:
-        import sys
         return sys.stdout
 
     if isinstance(out, io.TextIOBase):