bpo-27513: email.utils.getaddresses() now handles Header objects (GH-13797) (GH-27242)

getaddresses() should be able to handle a Header object if passed
one.

Co-authored-by: Łukasz Langa <lukasz@langa.pl>
(cherry picked from commit 89f4c34797)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Lib/email/utils.py

@@ -109,7 +109,7 @@ def formataddr(pair, charset='utf-8'):
 
 def getaddresses(fieldvalues):
     """Return a list of (REALNAME, EMAIL) for each fieldvalue."""
-    all = COMMASPACE.join(fieldvalues)
+    all = COMMASPACE.join(str(v) for v in fieldvalues)
     a = _AddressList(all)
     return a.addresslist
 

Lib/test/test_email/test_email.py

@@ -3263,6 +3263,11 @@ Foo
         addrs = utils.getaddresses(['User ((nested comment)) <foo@bar.com>'])
         eq(addrs[0][1], 'foo@bar.com')
 
+    def test_getaddresses_header_obj(self):
+        """Test the handling of a Header object."""
+        addrs = utils.getaddresses([Header('Al Person <aperson@dom.ain>')])
+        self.assertEqual(addrs[0][1], 'aperson@dom.ain')
+
     def test_make_msgid_collisions(self):
         # Test make_msgid uniqueness, even with multiple threads
         class MsgidsThread(Thread):

Misc/NEWS.d/next/Library/2019-06-03-23-53-25.bpo-27513.qITN7d.rst

@@ -0,0 +1,3 @@
+:func:`email.utils.getaddresses` now accepts
+:class:`email.header.Header` objects along with string values.
+Patch by Zackery Spytz.