From 1c143605a92dff49c3dbf58e6d14097cd72db68a Mon Sep 17 00:00:00 2001
From: Bob Halley <halley@dnspython.org>
Date: Tue, 20 Feb 2018 12:13:26 -0800
Subject: [PATCH] Remove deprecated U option to open on python 3. [Issue #252]

---
 dns/zone.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dns/zone.py b/dns/zone.py
index 37f23d3d..6606bef0 100644
--- a/dns/zone.py
+++ b/dns/zone.py
@@ -1021,7 +1021,10 @@ def from_file(f, origin=None, rdclass=dns.rdataclass.IN,
     """
 
     str_type = string_types
-    opts = 'rU'
+    if PY3:
+        opts = 'rU'
+    else:
+        opts = 'r'
 
     if isinstance(f, str_type):
         if filename is None:
-- 
2.47.3