Merge: #21091: make is_attachment a method.

Doc/library/email.contentmanager.rst

@@ -70,11 +70,15 @@ this module.
    the following methods:
 
 
-   .. attribute:: is_attachment
+   .. method:: is_attachment
 
-      Set to ``True`` if there is a :mailheader:`Content-Disposition` header
+      Return ``True`` if there is a :mailheader:`Content-Disposition` header
       and its (case insensitive) value is ``attachment``, ``False`` otherwise.
 
+      .. versionchanged:: 3.4.2
+         is_attachment is now a method instead of a property, for consistency
+         with :meth:`~email.message.Message.is_multipart`.
+
 
    .. method:: get_body(preferencelist=('related', 'html', 'plain'))
 

Lib/email/message.py

@@ -9,6 +9,7 @@ __all__ = ['Message']
 import re
 import uu
 import quopri
+import warnings
 from io import BytesIO, StringIO
 
 # Intrapackage imports
@@ -938,13 +939,12 @@ class MIMEPart(Message):
             policy = default
         Message.__init__(self, policy)
 
-    @property
     def is_attachment(self):
         c_d = self.get('content-disposition')
         return False if c_d is None else c_d.content_disposition == 'attachment'
 
     def _find_body(self, part, preferencelist):
-        if part.is_attachment:
+        if part.is_attachment():
             return
         maintype, subtype = part.get_content_type().split('/')
         if maintype == 'text':
@@ -1037,7 +1037,7 @@ class MIMEPart(Message):
         for part in parts:
             maintype, subtype = part.get_content_type().split('/')
             if ((maintype, subtype) in self._body_types and
-                    not part.is_attachment and subtype not in seen):
+                    not part.is_attachment() and subtype not in seen):
                 seen.append(subtype)
                 continue
             yield part

Lib/test/test_email/test_message.py

@@ -722,15 +722,15 @@ class TestEmailMessageBase:
 
     def test_is_attachment(self):
         m = self._make_message()
-        self.assertFalse(m.is_attachment)
+        self.assertFalse(m.is_attachment())
         m['Content-Disposition'] = 'inline'
-        self.assertFalse(m.is_attachment)
+        self.assertFalse(m.is_attachment())
         m.replace_header('Content-Disposition', 'attachment')
-        self.assertTrue(m.is_attachment)
+        self.assertTrue(m.is_attachment())
         m.replace_header('Content-Disposition', 'AtTachMent')
-        self.assertTrue(m.is_attachment)
+        self.assertTrue(m.is_attachment())
         m.set_param('filename', 'abc.png', 'Content-Disposition')
-        self.assertTrue(m.is_attachment)
+        self.assertTrue(m.is_attachment())
 
 
 class TestEmailMessage(TestEmailMessageBase, TestEmailBase):

Misc/NEWS

@@ -137,6 +137,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #21091: Fix API bug: email.message.EmailMessage.is_attachment is now
+  a method.
+
 - Issue #21079: Fix email.message.EmailMessage.is_attachment to return the
   correct result when the header has parameters as well as a value.