diff --git a/inst/loops/zshell.sh b/inst/loops/zshell.sh
index c1c0473..dda6de1 100755
--- a/inst/loops/zshell.sh
+++ b/inst/loops/zshell.sh
@@ -2,7 +2,7 @@
 set -a
 
 # use environment variables for instance-specific configuration:
-#ZOPE_CONF=zope-1.conf
+#SERVER_ID=0
 #LOOPS_PATH=sites/mysite
 
 python -ic "from loops.server import psu; psu.setup()"
diff --git a/loops/browser/util.py b/loops/browser/util.py
index a0ed39a..51cffb5 100644
--- a/loops/browser/util.py
+++ b/loops/browser/util.py
@@ -3,7 +3,8 @@
 """ Utilities.
 """
 
-import re, urllib
+import re
+import urllib.parse
 from zope.browserpage import ViewPageTemplateFile
 from zope.browsermenu.menu import BrowserMenu
 from zope.browsermenu.interfaces import IBrowserSubMenuItem
@@ -51,4 +52,4 @@ def html_quote(text, character_entities=((u'&', u'&amp;'), (u'<', u'&lt;' ),
 pattern = re.compile(r'[ /\?\+\|%]')
 
 def normalizeForUrl(text):
-    return urllib.quote(pattern.sub('-', text).encode('UTF-8'))
+    return urllib.parse.quote(pattern.sub('-', text).encode('UTF-8'))
diff --git a/loops/organize/presence.py b/loops/organize/presence.py
index 71efc07..6216b06 100644
--- a/loops/organize/presence.py
+++ b/loops/organize/presence.py
@@ -31,7 +31,7 @@ class Presence(object):
 
     def removeInactiveUsers(self):
         toDelete = []
-        for id, timeStamp in self.presentUsers.iteritems():
+        for id, timeStamp in self.presentUsers.items():
             if (getTimeStamp() - timeStamp) > (self.min_until_logout*60):
                 toDelete.append(id)
         for id in toDelete:
@@ -40,7 +40,7 @@ class Presence(object):
 
     def getPresentUsers(self, context=None):
         ret = []
-        for id, timeStamp in self.presentUsers.iteritems():
+        for id, timeStamp in self.presentUsers.items():
             principal = util.getPrincipalForUserId(id)
             person = getPersonForUser(context, principal=principal)
             ret.append(person or principal)
diff --git a/loops/resource.py b/loops/resource.py
index 23b30d7..92aa0be 100644
--- a/loops/resource.py
+++ b/loops/resource.py
@@ -496,7 +496,7 @@ class DocumentReadFileAdapter(object):
 
     def read(self):
         data = self.data
-        if type(data) is unicode:
+        if type(data) is str:
             return self.data.encode('UTF-8')
         else:
             return data