Test cases and fixes for bugs described in patch #873418: email/Message.py:

del_param fails when specifying a header.

Lib/email/Message.py

@@ -664,7 +664,7 @@ class Message:
         if not self.has_key(header):
             return
         new_ctype = ''
-        for p, v in self.get_params(header, unquote=requote):
+        for p, v in self.get_params(header=header, unquote=requote):
             if p.lower() <> param.lower():
                 if not new_ctype:
                     new_ctype = _formatparam(p, v, requote)
@@ -700,7 +700,7 @@ class Message:
         if not self.has_key(header):
             self[header] = type
             return
-        params = self.get_params(header, unquote=requote)
+        params = self.get_params(header=header, unquote=requote)
         del self[header]
         self[header] = type
         # Skip the first param; it's the old type.

Lib/email/test/test_email.py

@@ -354,6 +354,12 @@ class TestMessageAPI(TestEmailBase):
             ('boundary', 'D1690A7AC1.996856090/mail.example.com'),
             ('report-type', old_val)])
 
+    def test_del_param_on_other_header(self):
+        msg = Message()
+        msg.add_header('Content-Disposition', 'attachment', filename='bud.gif')
+        msg.del_param('filename', 'content-disposition')
+        self.assertEqual(msg['content-disposition'], 'attachment')
+
     def test_set_type(self):
         eq = self.assertEqual
         msg = Message()
@@ -365,6 +371,12 @@ class TestMessageAPI(TestEmailBase):
         msg.set_type('text/html')
         eq(msg['content-type'], 'text/html; charset="us-ascii"')
 
+    def test_set_type_on_other_header(self):
+        msg = Message()
+        msg['X-Content-Type'] = 'text/plain'
+        msg.set_type('application/octet-stream', 'X-Content-Type')
+        self.assertEqual(msg['x-content-type'], 'application/octet-stream')
+
     def test_get_content_type_missing(self):
         msg = Message()
         self.assertEqual(msg.get_content_type(), 'text/plain')