first steps to make it work in python3

setup.py

@@ -19,13 +19,16 @@
 setup(
     name='collective.isotope',
     version='0.1-dev',
-    description="A view for folders and collections using the Isotope jquery plugin",
+    description="Plone view for folders and collections using the Isotope "
+                "jquery plugin",
     long_description=long_description,
     # Get more from http://pypi.python.org/pypi?%3Aaction=list_classifiers
     classifiers=[
         "Environment :: Web Environment",
         "Framework :: Plone",
         "Framework :: Plone :: 5.0",
+        "Framework :: Plone :: 5.2",
+        "Framework :: Plone :: 5.2",
         "Programming Language :: Python",
         "Programming Language :: Python :: 2.7",
         "Operating System :: OS Independent",
@@ -42,9 +45,10 @@
     include_package_data=True,
     zip_safe=False,
     install_requires=[
+        'collective.z3cform.datagridfield',
         'plone.api',
         'setuptools',
-        'collective.z3cform.datagridfield',
+        'six',
     ],
     extras_require={
         'test': [

src/collective/isotope/browser/views.py

@@ -6,11 +6,6 @@
 from ..interfaces import IValueConverter
 from collective.isotope import _
 from itertools import chain
-from itertools import ifilter
-from itertools import imap
-from itertools import izip
-
-# from plone import api
 from plone.app.contenttypes.browser.collection import CollectionView
 from plone.app.contenttypes.browser.folder import FolderView
 from plone.i18n.normalizer.interfaces import IIDNormalizer
@@ -30,6 +25,7 @@
 
 import collections
 import json
+import six.moves
 
 
 ISOTOPE_CONFIGURATION_KEY = 'collective.isotope.configuration'
@@ -198,7 +194,8 @@ def _get_sorts_label(self, column):
         return self._get_column_label(column, 'sorts')
 
     def _get_column_label(self, column, type_):
-        """return the label for a given column name from the named vocabulary"""
+        """return the label for a given column name from the named vocabulary
+        """
         name = 'collective.isotope.vocabularies.available_{}'.format(type_)
         factory = queryUtility(IVocabularyFactory, name=name, default=None)
         if factory is not None:
@@ -223,12 +220,12 @@ def _get_filter_values(self, filter, raw):
         converter = queryUtility(
             IValueConverter, name=converter_name, default=None
         )
-        values = imap(self.normalizer.normalize, raw)
+        values = six.moves.map(self.normalizer.normalize, raw)
         labels = raw
         if converter:
-            labels = imap(converter, raw)
+            labels = six.moves.map(converter, raw)
 
-        return ifilter(lambda x: x[1], izip(values, labels))
+        return six.moves.filter(lambda x: x[1], six.moves.zip(values, labels))
 
 
 class IsotopeCollectionView(IsotopeViewMixin, CollectionView):

src/collective/isotope/interfaces.py

@@ -6,7 +6,7 @@
 from plone.registry import field
 from z3c.form.interfaces import NO_VALUE
 from zope import schema
-from zope.interface import implements
+from zope.interface import implementer
 from zope.interface import Interface
 from zope.publisher.interfaces.browser import IDefaultBrowserLayer
 
@@ -31,8 +31,9 @@ def convert(value):
 
 
 # A DictRow is an IDict for import/export purposes
+@implementer(schema.interfaces.IDict)
 class ImportableTextDictRow(DictRow, schema.MinMaxLen):
-    implements(schema.interfaces.IDict)
+
     # We treat all values as text for simplicity of import/export.
     # Unfortunately, non-text values will result in duplicates when
     # purge="False"