Conform to pep8 and pylint :

pep8 version: 2.3.1
./ConfigTreeNode.py:130:49: E231 missing whitespace after ','
./editors/Viewer.py:643:24: E128 continuation line under-indented for visual indent
./editors/Viewer.py:670:12: E221 multiple spaces before operator
./editors/Viewer.py:671:13: E221 multiple spaces before operator
./editors/Viewer.py:2138:52: E203 whitespace before ':'
./editors/Viewer.py:2139:66: W291 trailing whitespace
./controls/VariablePanel.py:154:25: E231 missing whitespace after ','
./controls/LocationCellEditor.py:88:1: W293 blank line contains whitespace
./controls/LocationCellEditor.py:191:25: E221 multiple spaces before operator
./controls/LocationCellEditor.py:200:17: E128 continuation line under-indented for visual indent

pylint 1.8.3,
************* Module controls.LocationCellEditor
controls/LocationCellEditor.py:200: [C0330(bad-continuation), ] Wrong continued indentation (add 9 spaces).
_("Selected location is identical to previous one"))
^ |
************* Module controls.VariablePanel
controls/VariablePanel.py:154: [E1601(print-statement), VariableTable.SetValue] print statement used
************* Module editors.Viewer
editors/Viewer.py:643: [C0330(bad-continuation), ] Wrong continued indentation (add 1 space).
self.GetAddMenuCallBack(self.AddNewComment))
^|
editors/Viewer.py:598: [W0612(unused-variable), Viewer.AddDivergenceMenuItems] Unused variable 'add_branch'
editors/Viewer.py:1655: [E0602(undefined-variable), Viewer.PopupConnectionMenu] Undefined variable 'variable_type'
editors/Viewer.py:1649: [W0612(unused-variable), Viewer.PopupConnectionMenu] Unused variable 'connection_type'
************* Module connectors.PYRO.PSK_Adapter

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# See COPYING file for copyrights details.

from __future__ import absolute_import
import wx


# class RichMessageDialog is still not available in wxPython 3.0.2
class IDMergeDialog(wx.Dialog):
    def __init__(self, parent, title, question, optiontext, button_texts):
        wx.Dialog.__init__(self, parent, title=title)

        main_sizer = wx.BoxSizer(wx.VERTICAL)

        message = wx.StaticText(self, label=question)
        main_sizer.AddWindow(message, border=20,
                             flag=wx.ALIGN_CENTER_HORIZONTAL | wx.TOP | wx.LEFT | wx.RIGHT)

        self.check = wx.CheckBox(self, label=optiontext)
        main_sizer.AddWindow(self.check, border=20,
                             flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.ALIGN_CENTER_HORIZONTAL)

        buttons_sizer = wx.BoxSizer(wx.HORIZONTAL)
        for label, wxID in zip(button_texts, [wx.ID_YES, wx.ID_NO, wx.ID_CANCEL]):
            Button = wx.Button(self, label=label)

            def OnButtonFactory(_wxID):
                return lambda event: self.EndModal(_wxID)

            self.Bind(wx.EVT_BUTTON, OnButtonFactory(wxID), Button)
            buttons_sizer.AddWindow(Button)

        main_sizer.AddSizer(buttons_sizer, border=20,
                            flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.ALIGN_RIGHT)

        self.SetSizer(main_sizer)
        self.Fit()

        self.Bind(wx.EVT_CHAR_HOOK, self.OnEscapeKey)

    def OnEscapeKey(self, event):
        keycode = event.GetKeyCode()
        if keycode == wx.WXK_ESCAPE:
            self.EndModal(wx.ID_CANCEL)
        else:
            event.Skip()

    def OptionChecked(self):
        return self.check.GetValue()