Super and Subscript using wxPython

# wxPython's wx.lib.fancytext can show super and subscripts, fonts and colours

import  wx
import  wx.lib.fancytext as fancytext

class FancyText(wx.Panel):
    """display fancytext on a panel"""
    def __init__(self, parent):
        wx.Panel.__init__(self, parent, -1)
        self.SetBackgroundColour('white')
        self.Bind(wx.EVT_PAINT, self.OnPaint)

    def OnPaint(self, evt):
        """display the fancytext on a paintdc surface"""
        dc = wx.PaintDC(self)
        # need height to calculate y position of str2
        w, h = fancytext.GetExtent(xml_str1, dc)
        # enclose is True by default (start and end tags not needed)
        fancytext.RenderToDC(xml_str1, dc, 20, 20)
        fancytext.RenderToDC(xml_str2, dc, 20, 20 + h + 5)


# these are XML code strings
xml_str1 = ('<font style="italic" family="swiss" color="red" weight="bold" >'
            'some fancy text y = x<sup>0.5</sup>  now text<sub>with subscript</sub>'
            '   <times/> <infinity/> <angle/></font>  back to plain text')

xml_str2 = '<font family="swiss" color="blue" size="48">feeling blue?</font>'


# test FancyText
if __name__ == '__main__':
    app = wx.PySimpleApp()
    pos = wx.DefaultPosition
    frame = wx.Frame(None, -1, title='wxPython fancy text', pos=pos, size=(500, 200))
    tp = FancyText(frame)
    frame.Show(True)
    app.MainLoop()