diff --git a/CHANGES.rst b/CHANGES.rst
index e690b5b..3b05f7e 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -21,6 +21,9 @@ Bug fixes:
 - Allow defaults to be set on dexterity type fields via the web UI (@@fields)
   [ezvirtual]
 
+- Fix tests in py3 and some py3 issues.
+  [pbauer]
+
 
 2.0.19 (2018-02-02)
 -------------------
diff --git a/plone/schemaeditor/browser/schema/add_field.py b/plone/schemaeditor/browser/schema/add_field.py
index bcaff20..679f2ea 100644
--- a/plone/schemaeditor/browser/schema/add_field.py
+++ b/plone/schemaeditor/browser/schema/add_field.py
@@ -46,7 +46,7 @@ def create(self, data):
         factory = data.pop('factory')
 
         # split regular attributes and extra ones
-        for key in data.keys():
+        for key in list(data.keys()):
             if key not in self._schema:
                 extra[key] = data[key]
                 data.pop(key)
diff --git a/plone/schemaeditor/browser/schema/traversal.py b/plone/schemaeditor/browser/schema/traversal.py
index effefff..ebf87a5 100644
--- a/plone/schemaeditor/browser/schema/traversal.py
+++ b/plone/schemaeditor/browser/schema/traversal.py
@@ -6,6 +6,8 @@
 from zope.publisher.interfaces.browser import IBrowserPublisher
 from ZPublisher.BaseRequest import DefaultPublishTraverse
 
+import six
+
 
 @implementer(ISchemaContext, IBrowserPublisher)
 class SchemaContext(SimpleItem):
@@ -21,7 +23,6 @@ class SchemaContext(SimpleItem):
     enableFieldsets = True
 
     def __init__(self, context, request, name=u'schema', title=None):
-        super(SchemaContext, self).__init__(context, request)
         self.schema = context
         self.request = request
 
diff --git a/plone/schemaeditor/tests/choice.rst b/plone/schemaeditor/tests/choice.rst
index d2d665e..d3c2a07 100644
--- a/plone/schemaeditor/tests/choice.rst
+++ b/plone/schemaeditor/tests/choice.rst
@@ -58,7 +58,7 @@ If duplicate values are entered an error is raised.
     ...     ['Alaska', 'Russia', 'United States', 'United States',
     ...      'Other'])
     >>> browser.getControl('Save').click()
-    >>> print browser.contents
+    >>> print(browser.contents)
     <...
       <div class="error">The 'United States' vocabulary value conflicts with 'United States'.</div>
     ...
@@ -118,7 +118,7 @@ We can't set a vocabulary name AND values.
     >>> browser.getLink(url='country').click()
     >>> browser.getControl('values').value = "oups"
     >>> browser.getControl('Save').click()
-    >>> print browser.contents
+    >>> print(browser.contents)
     <...
       <div class="error">You can not set a vocabulary name AND vocabulary values....
     ...
@@ -166,7 +166,7 @@ If duplicate values are entered an error is raised.
     >>> ctl.value = '\n'.join(
     ...     ['Lisp', 'Plone', 'Python', 'Lisp'])
     >>> browser.getControl('Save').click()
-    >>> print browser.contents
+    >>> print(browser.contents)
     <...
       <div class="error">The 'Lisp' vocabulary value conflicts with 'Lisp'.</div>
     ...
@@ -210,7 +210,7 @@ Back to the edit form, vocabulary name is selected.
 
     >>> browser.open(portal_url + '/@@schemaeditor')
     >>> browser.getLink(url='categories').click()
-    >>> print browser.contents
+    >>> print(browser.contents)
     <...
     ... selected>plone.schemaeditor.test.Categories</option...
     ...
diff --git a/plone/schemaeditor/tests/editing.rst b/plone/schemaeditor/tests/editing.rst
index 9d230b7..b9849a9 100644
--- a/plone/schemaeditor/tests/editing.rst
+++ b/plone/schemaeditor/tests/editing.rst
@@ -20,7 +20,7 @@ error::
     >>> browser.open(portal_url + '/@@schemaeditor')
     Traceback (most recent call last):
     ...
-    Unauthorized: ...You are not authorized to access this resource...
+    zExceptions.unauthorized.Unauthorized: ...You are not authorized to access this resource...
 
 We need to log in as a manager, because by default only managers get the 'Manage Schemata' permission::
 
@@ -62,11 +62,11 @@ normalized form of the title)::
     >>> isinstance(IDummySchema['favorite_color'], TextLine)
     True
     >>> IDummySchema['favorite_color'].title
-    u'Favorite Color'
+    'Favorite Color'
     >>> IDummySchema['favorite_color'].required
     True
     >>> IDummySchema['favorite_color'].description
-    u'Select your favorite color'
+    'Select your favorite color'
 
 
 Editing a schema field attribute
@@ -98,7 +98,7 @@ of schema fields, which should reflect the change::
 Let's confirm that the new default value was correctly saved to the actual schema::
 
     >>> IDummySchema['favorite_color'].description
-    u'Enter your favorite color.'
+    'Enter your favorite color.'
 
 If the schema is edited to have internationalized attributes::
 
@@ -130,11 +130,11 @@ value was set::
     >>> type(IDummySchema['favorite_color'].description)
     <... 'zope.i18nmessageid.message.Message'>
     >>> IDummySchema['favorite_color'].description
-    u'favorite_color'
+    'favorite_color'
     >>> IDummySchema['favorite_color'].description.domain
     'plone'
     >>> IDummySchema['favorite_color'].description.default
-    u'Enter your favorite color.'
+    'Enter your favorite color.'
 
 Let's also check that the support for editing i18n Message values does not
 persist its marker interface::
@@ -193,7 +193,7 @@ testbrowser doesn't support Javascript)::
     [event: ContainerModifiedEvent on InterfaceClass]
     [event: SchemaModifiedEvent on DummySchemaContext]
     >>> browser.contents
-    ''
+    b''
 
 Now the field should be the third field of the schema::
 
@@ -220,7 +220,7 @@ They are moved to the end of the new fieldset::
     [event: ContainerModifiedEvent on InterfaceClass]
     [event: SchemaModifiedEvent on DummySchemaContext]
     >>> browser.contents
-    ''
+    b''
 
 Now the field should be the seventh field of the schema::
 
@@ -236,7 +236,7 @@ They can be ordered into a fieldset::
     [event: ContainerModifiedEvent on InterfaceClass]
     [event: SchemaModifiedEvent on DummySchemaContext]
     >>> browser.contents
-    ''
+    b''
     >>> get_field_fieldset(IDummySchema, 'favorite_color')
     <Fieldset 'alpha'...of favorite_color, fieldA>
 
@@ -301,7 +301,7 @@ move it into an other fieldset and remove it::
     [event: ContainerModifiedEvent on InterfaceClass]
     [event: SchemaModifiedEvent on DummySchemaContext]
     >>> browser.contents
-    ''
+    b''
     >>> browser.open('http://nohost/@@schemaeditor')
     >>> browser.getLink(url='other_set/@@delete').click()
     [event: ObjectRemovedEvent on TextLine]
diff --git a/plone/schemaeditor/tests/extending.rst b/plone/schemaeditor/tests/extending.rst
index a9f1825..8685e92 100644
--- a/plone/schemaeditor/tests/extending.rst
+++ b/plone/schemaeditor/tests/extending.rst
@@ -76,4 +76,4 @@ We can save a color and confirm that it ends up in the schema's tagged values::
   [event: SchemaModifiedEvent on DummySchemaContext]
   >>> from plone.schemaeditor.tests.fixtures import IDummySchema
   >>> IDummySchema.getTaggedValue('color')
-  {'field1': u'green'}
+  {'field1': 'green'}
diff --git a/plone/schemaeditor/tests/tests.py b/plone/schemaeditor/tests/tests.py
index 3d4fc82..e43aba1 100644
--- a/plone/schemaeditor/tests/tests.py
+++ b/plone/schemaeditor/tests/tests.py
@@ -11,6 +11,8 @@
 import doctest
 import os
 import plone.schemaeditor
+import re
+import six
 import unittest
 
 
@@ -34,6 +36,15 @@ def tearDown(self):
     classImplements(implementedBy(BaseRequest) - ITestLayer)
 
 
+class Py23DocChecker(doctest.OutputChecker):
+    def check_output(self, want, got, optionflags):
+        if six.PY2:
+            want = re.sub('zExceptions.unauthorized.Unauthorized', 'Unauthorized', want)
+            got = re.sub("u'(.*?)'", "'\\1'", got)
+            want = re.sub("b'(.*?)'", "'\\1'", want)
+        return doctest.OutputChecker.check_output(self, want, got, optionflags)
+
+
 def test_suite():
     return unittest.TestSuite([
 
@@ -45,7 +56,8 @@ def test_suite():
             'minmax.rst',
             setUp=setUp,
             tearDown=tearDown,
-            optionflags=optionflags
+            optionflags=optionflags,
+            checker=Py23DocChecker(),
         ),
 
     ])
diff --git a/setup.py b/setup.py
index 067f12c..7cf34ec 100644
--- a/setup.py
+++ b/setup.py
@@ -16,8 +16,11 @@
         "Framework :: Plone",
         "Framework :: Plone :: 5.0",
         "Framework :: Plone :: 5.1",
+        "Framework :: Plone :: 5.2",
         "Programming Language :: Python",
         "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
         "Topic :: Software Development :: Libraries :: Python Modules",
         "License :: OSI Approved :: BSD License",
     ],