--- a/BeremizIDE.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/BeremizIDE.py	Thu Oct 04 11:25:42 2018 +0300
@@ -35,7 +35,7 @@
 from time import time as gettime
 from threading import Lock, Timer, currentThread
 
-import cPickle
+from six.moves import cPickle
 import wx.lib.buttons
 import wx.lib.statbmp
 import wx.stc

--- a/Beremiz_service.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/Beremiz_service.py	Thu Oct 04 11:25:42 2018 +0300
@@ -32,7 +32,7 @@
 import threading
 from threading import Thread, Semaphore, Lock
 import traceback
-import __builtin__
+from six.moves import builtins
 import Pyro
 import Pyro.core as pyro
 
@@ -143,7 +143,7 @@
     argv = [WorkingDir]
 
 if __name__ == '__main__':
-    __builtin__.__dict__['_'] = lambda x: x
+    builtins.__dict__['_'] = lambda x: x
     # TODO: add a cmdline parameter if Trying Preloading Xenomai makes problem
     TryPreloadXenomai()
     version()
@@ -162,12 +162,12 @@
     domain = "Beremiz"
 
     # Define locale for wx
-    loc = __builtin__.__dict__.get('loc', None)
+    loc = builtins.__dict__.get('loc', None)
     if loc is None:
         wx.LogGui.EnableLogging(False)
         loc = wx.Locale(langid)
         wx.LogGui.EnableLogging(True)
-        __builtin__.__dict__['loc'] = loc
+        builtins.__dict__['loc'] = loc
         # Define location for searching translation files
     loc.AddCatalogLookupPathPrefix(localedir)
     # Define locale domain
@@ -186,8 +186,8 @@
         return wx.GetTranslation(message).encode(default_locale)
 
     if __name__ == '__main__':
-        __builtin__.__dict__['_'] = unicode_translation
-        # __builtin__.__dict__['_'] = wx.GetTranslation
+        builtins.__dict__['_'] = unicode_translation
+        # builtins.__dict__['_'] = wx.GetTranslation
 
 
 # Life is hard... have a candy.

--- a/IDEFrame.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/IDEFrame.py	Thu Oct 04 11:25:42 2018 +0300
@@ -24,13 +24,13 @@
 
 from __future__ import absolute_import
 import sys
-import cPickle
 from types import TupleType
 import base64
 
 import wx
 import wx.grid
 import wx.aui
+from six.moves import cPickle
 
 from editors.EditorPanel import EditorPanel
 from editors.SFCViewer import SFC_Viewer

--- a/controls/TextCtrlAutoComplete.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/controls/TextCtrlAutoComplete.py	Thu Oct 04 11:25:42 2018 +0300
@@ -24,7 +24,7 @@
 
 
 from __future__ import absolute_import
-import cPickle
+from six.moves import cPickle
 import wx
 
 MAX_ITEM_COUNT = 10

--- a/docutil/docpdf.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/docutil/docpdf.py	Thu Oct 04 11:25:42 2018 +0300
@@ -34,16 +34,16 @@
 
 def get_acroversion():
     " Return version of Adobe Acrobat executable or None"
-    import _winreg
-    adobesoft = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, r'Software\Adobe')
-    for index in range(_winreg.QueryInfoKey(adobesoft)[0]):
-        key = _winreg.EnumKey(adobesoft, index)
+    from six.moves import winreg
+    adobesoft = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r'Software\Adobe')
+    for index in range(winreg.QueryInfoKey(adobesoft)[0]):
+        key = winreg.EnumKey(adobesoft, index)
         if "acrobat" in key.lower():
-            acrokey = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, 'Software\\Adobe\\%s' % key)
-            for index in range(_winreg.QueryInfoKey(acrokey)[0]):
-                numver = _winreg.EnumKey(acrokey, index)
+            acrokey = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, 'Software\\Adobe\\%s' % key)
+            for index in range(winreg.QueryInfoKey(acrokey)[0]):
+                numver = winreg.EnumKey(acrokey, index)
                 try:
-                    res = _winreg.QueryValue(_winreg.HKEY_LOCAL_MACHINE, 'Software\\Adobe\\%s\\%s\\InstallPath' % (key, numver))
+                    res = winreg.QueryValue(winreg.HKEY_LOCAL_MACHINE, 'Software\\Adobe\\%s\\%s\\InstallPath' % (key, numver))
                     return res
                 except Exception:
                     pass

--- a/docutil/docsvg.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/docutil/docsvg.py	Thu Oct 04 11:25:42 2018 +0300
@@ -31,13 +31,13 @@
 
 def get_inkscape_path():
     """ Return the Inkscape path """
-    import _winreg
+    from six.moves import winreg
     try:
-        svgexepath = _winreg.QueryValue(_winreg.HKEY_LOCAL_MACHINE,
-                                        'Software\\Classes\\svgfile\\shell\\Inkscape\\command')
+        svgexepath = winreg.QueryValue(winreg.HKEY_LOCAL_MACHINE,
+                                       'Software\\Classes\\svgfile\\shell\\Inkscape\\command')
     except OSError:
-        svgexepath = _winreg.QueryValue(_winreg.HKEY_LOCAL_MACHINE,
-                                        'Software\\Classes\\inkscape.svg\\shell\\open\\command')
+        svgexepath = winreg.QueryValue(winreg.HKEY_LOCAL_MACHINE,
+                                       'Software\\Classes\\inkscape.svg\\shell\\open\\command')
     svgexepath = svgexepath.replace('"%1"', '')
     return svgexepath.replace('"', '')
 

--- a/runtime/PLCObject.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/runtime/PLCObject.py	Thu Oct 04 11:25:42 2018 +0300
@@ -23,7 +23,6 @@
 
 
 from __future__ import absolute_import
-import thread
 from threading import Thread, Lock, Semaphore, Event, Condition
 import ctypes
 import os
@@ -33,6 +32,7 @@
 import _ctypes  # pylint: disable=wrong-import-order
 import Pyro.core as pyro
 import six
+from six.moves import _thread
 
 from runtime.typemapping import TypeTranslator
 from runtime.loglevels import LogLevelsDefault, LogLevelsCount
@@ -104,7 +104,7 @@
         """
         meant to be called by worker thread (blocking)
         """
-        self._threadID = thread.get_ident()
+        self._threadID = _thread.get_ident()
         if args or kwargs:
             job(*args, **kwargs).do()
             # result is ignored
@@ -128,7 +128,7 @@
 
         _job = job(*args, **kwargs)
 
-        if self._threadID == thread.get_ident() or self._threadID is None:
+        if self._threadID == _thread.get_ident() or self._threadID is None:
             # if caller is worker thread execute immediately
             _job.do()
         else:

--- a/svgui/pyjs/build.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/svgui/pyjs/build.py	Thu Oct 04 11:25:42 2018 +0300
@@ -10,7 +10,7 @@
 from os.path import join, basename, abspath, split, isfile, isdir
 from hashlib import md5
 from optparse import OptionParser
-from cStringIO import StringIO
+from six.moves import cStringIO
 
 from svgui.pyjs import pyjs
 
@@ -254,7 +254,7 @@
 
     # the selector templ is added to the selectScript function
     select_tmpl = """O(["true","%s"],"%s");"""
-    script_selectors = StringIO()
+    script_selectors = cStringIO()
 
     for platform, file_prefix in app_files:
         print(select_tmpl % (platform, file_prefix), file=script_selectors)
@@ -453,7 +453,7 @@
             if dynamic:
                 mod_cache_html_output = open(join(output, mod_cache_name), "w")
             else:
-                mod_cache_html_output = StringIO()
+                mod_cache_html_output = cStringIO()
 
             print(mod_cache_html_template % dict(
                 mod_name=mod_name,

--- a/svgui/pyjs/pyjs.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/svgui/pyjs/pyjs.py	Thu Oct 04 11:25:42 2018 +0300
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-# pylint: disable=no-absolute-import
+# pylint: disable=no-absolute-import,bad-python3-import
 
 from __future__ import print_function
 import sys
@@ -22,7 +22,7 @@
 from compiler import ast
 import os
 import copy
-import cStringIO
+from six.moves import cStringIO
 
 # the standard location for builtins (e.g. pyjslib) can be
 # over-ridden by changing this.  it defaults to sys.prefix
@@ -1443,7 +1443,7 @@
             raise TranslationError("varargs are not supported in Lambdas", node)
         if node.kwargs:
             raise TranslationError("kwargs are not supported in Lambdas", node)
-        res = cStringIO.StringIO()
+        res = cStringIO()
         arg_names = list(node.argnames)
         function_args = ", ".join(arg_names)
         for child in node.getChildNodes():
@@ -1534,7 +1534,7 @@
     f = file(file_name, "r")
     src = f.read()
     f.close()
-    output = cStringIO.StringIO()
+    output = cStringIO()
     mod = compiler.parseFile(file_name)
     Translator(module_name, module_name, module_name, src, debug, mod, output)
     return output.getvalue()
@@ -1683,7 +1683,7 @@
 
         file_name = self.findFile(module_name + self.extension)
 
-        output = cStringIO.StringIO()
+        output = cStringIO()
 
         f = file(file_name, "r")
         src = f.read()
@@ -1718,8 +1718,8 @@
 
     def translate(self, module_name, is_app=True, debug=False,
                   library_modules=None):
-        app_code = cStringIO.StringIO()
-        lib_code = cStringIO.StringIO()
+        app_code = cStringIO()
+        lib_code = cStringIO()
         imported_js = set()
         self.library_modules = []
         self.overrides = {}

--- a/tests/tools/check_source.sh	Wed Oct 03 15:47:59 2018 +0300
+++ b/tests/tools/check_source.sh	Thu Oct 04 11:25:42 2018 +0300
@@ -347,6 +347,9 @@
     enable=$enable,W0612          # (unused-variable) Unused variable 'X'
     enable=$enable,C0330          # (bad-continuation) Wrong hanging indentation before block
     enable=$enable,R0123          # (literal-comparison) Comparison to literal
+
+    # python3 compatibility checks
+    enable=$enable,W1648          # (bad-python3-import) Module moved in Python 3
     # enable=
 
     options=

--- a/util/TranslationCatalogs.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/util/TranslationCatalogs.py	Thu Oct 04 11:25:42 2018 +0300
@@ -25,14 +25,14 @@
 
 from __future__ import absolute_import
 import os
-import __builtin__
+from six.moves import builtins
 import wx
 
 
 locale = None
 
 
-__builtin__.__dict__['_'] = wx.GetTranslation
+builtins.__dict__['_'] = wx.GetTranslation
 
 
 def GetDomain(path):

--- a/xmlclass/xmlclass.py	Wed Oct 03 15:47:59 2018 +0300
+++ b/xmlclass/xmlclass.py	Thu Oct 04 11:25:42 2018 +0300
@@ -31,7 +31,6 @@
 from types import *
 from xml.dom import minidom
 from xml.sax.saxutils import unescape
-from new import classobj
 from collections import OrderedDict
 
 from lxml import etree
@@ -1168,7 +1167,7 @@
         classmembers["getElementInfos"] = generateGetElementInfos(self, classinfos)
         classmembers["setElementValue"] = generateSetElementValue(self, classinfos)
 
-        class_definition = classobj(str(name), bases, classmembers)
+        class_definition = type(str(name), bases, classmembers)
         setattr(class_definition, "__getattr__", generateGetattrMethod(self, class_definition, classinfos))
         setattr(class_definition, "__setattr__", generateSetattrMethod(self, class_definition, classinfos))
         class_infos = {