From ff346cc9ff7239805d52f522a27fe8bf255ddfac Mon Sep 17 00:00:00 2001
From: Zackery Spytz <zspytz@gmail.com>
Date: Mon, 19 Jul 2021 09:07:54 -0700
Subject: [PATCH] bpo-27513: email.utils.getaddresses() now handles Header
 objects (GH-13797)
MIME-Version: 1.0
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getaddresses() should be able to handle a Header object if passed
one.

Co-authored-by: Łukasz Langa <lukasz@langa.pl>
(cherry picked from commit 89f4c34797de2f0e5045da2b97c1c8cbbb42fbb2)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
---
 Lib/email/utils.py                                           | 2 +-
 Lib/test/test_email/test_email.py                            | 5 +++++
 .../next/Library/2019-06-03-23-53-25.bpo-27513.qITN7d.rst    | 3 +++
 3 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2019-06-03-23-53-25.bpo-27513.qITN7d.rst

diff --git a/Lib/email/utils.py b/Lib/email/utils.py
index a8e46a761bf922..cfdfeb3f1a86e4 100644
--- a/Lib/email/utils.py
+++ b/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
 
diff --git a/Lib/test/test_email/test_email.py b/Lib/test/test_email/test_email.py
index eed60142b19e3b..0154bbad1f63f4 100644
--- a/Lib/test/test_email/test_email.py
+++ b/Lib/test/test_email/test_email.py
@@ -3263,6 +3263,11 @@ def test_getaddresses_embedded_comment(self):
         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):
diff --git a/Misc/NEWS.d/next/Library/2019-06-03-23-53-25.bpo-27513.qITN7d.rst b/Misc/NEWS.d/next/Library/2019-06-03-23-53-25.bpo-27513.qITN7d.rst
new file mode 100644
index 00000000000000..90d49bb2a993f1
--- /dev/null
+++ b/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.