Issue #16473: Fix byte transform codec documentation; test quotetabs=True

This changes the equivalent functions listed for the Base-64, hex and Quoted-
Printable codecs to reflect the functions actually used. Also mention and
test the "quotetabs" setting for Quoted-Printable encoding.

2 files changed, 9 insertions, 1 deletions

diff --git a/Lib/encodings/quopri_codec.py b/Lib/encodings/quopri_codec.py
index 0533dbe..496cb76 100644
--- a/Lib/encodings/quopri_codec.py
+++ b/Lib/encodings/quopri_codec.py
@@ -11,7 +11,7 @@ def quopri_encode(input, errors='strict'):
     assert errors == 'strict'
     f = BytesIO(input)
     g = BytesIO()
-    quopri.encode(f, g, 1)
+    quopri.encode(f, g, quotetabs=True)
     return (g.getvalue(), len(input))
 
 def quopri_decode(input, errors='strict'):
diff --git a/Lib/test/test_codecs.py b/Lib/test/test_codecs.py
index 6629ccd..8b78c24 100644
--- a/Lib/test/test_codecs.py
+++ b/Lib/test/test_codecs.py
@@ -2613,6 +2613,14 @@ class TransformCodecTest(unittest.TestCase):
                     info = codecs.lookup(alias)
                     self.assertEqual(info.name, expected_name)
 
+    def test_quopri_stateless(self):
+        # Should encode with quotetabs=True
+        encoded = codecs.encode(b"space tab\teol \n", "quopri-codec")
+        self.assertEqual(encoded, b"space=20tab=09eol=20\n")
+        # But should still support unescaped tabs and spaces
+        unescaped = b"space tab eol\n"
+        self.assertEqual(codecs.decode(unescaped, "quopri-codec"), unescaped)
+
     def test_uu_invalid(self):
         # Missing "begin" line
         self.assertRaises(ValueError, codecs.decode, b"", "uu-codec")