Fix open.write incompatibility between Py2 and Py3

Author: humitos

readthedocs/projects/utils.py

@@ -10,7 +10,7 @@
 
 import redis
 import six
-from builtins import object
+from builtins import object, open
 from django.conf import settings
 from django.core.cache import cache
 from httplib2 import Http
@@ -121,10 +121,10 @@ def safe_write(filename, contents):
     dirname = os.path.dirname(filename)
     if not os.path.exists(dirname):
         os.makedirs(dirname)
-    with open(filename, 'w') as fh:
-        fh.write(contents.encode('utf-8', 'ignore'))
-        fh.close()
 
+    with open(filename, 'w', encoding='utf-8', errors='ignore') as fh:
+        fh.write(contents)
+        fh.close()
 
 def purge_version(version, mainsite=False, subdomain=False, cname=False):
     varnish_servers = getattr(settings, 'VARNISH_SERVERS', None)