python 2.7 - Importing Editor from traitsui.wx.editor fails with AttributeError: 'module' object has no attribute 'CustomDataFormat' -


i using python2.7 conda env of necessary packages installed (as far know) on ubuntu 17.04, , can't enthought package, traitsui.wx.editor import: 

    import wx     import matplotlib     matplotlib.use('wxagg')      traits.api import *     traitsui.wx.editor import editor # raises attributeerror      traitsui.api import *     # traitsui.wx.editor import editor (raises runtimeerror)

what confusing me, if move problematic line after from traitsui.api import * runtimeerror: importing wx backend after selecting null backend!

the other error in full is: attributeerror: 'module' object has no attribute 'customdataformat'


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