Trying to add line numbers

I'm trying to add line numbers to my StyledTextCtrl().

That last line below in my code snippet seems to be the correct way to add 
line numbers in the 0 margin but when I run my small app, there are no line 
numbers in the left margin at all. Am I missing a step? Do I have to do 
something else?

My code snippet:

import wx
import wx.stc

class testApp(wx.Frame):
def __init__(self, *args, **kw):
# ensure the parent's __init__ is called
super(testApp, self).__init__(*args, **kw)

self.editor = wx.stc.StyledTextCtrl(self, style=wx.TE_MULTILINE)
self.editor.SetScrollWidth(wx.stc.STC_CACHE_CARET)
#self.stc.EditToggleOvertype()
self.editor.StyleSetSpec(wx.stc.STC_STYLE_DEFAULT, "size:10,face:Courier 
New, fore: #dddddd, back: #000000")
self.editor.SetMarginWidth(1, 20)
self.editor.SetMarginType(0, wx.stc.STC_MARGIN_NUMBER)

self.CreateStatusBar()
self.SetStatusText("Welcome to testApp")

if __name__ == '__main__':
app = wx.App()
win = testApp(None, title='testApp')
win.SetPosition(wx.Point(400, 400))
win.Show()

app.MainLoop()

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