wxPython: Write txt on wxBitmap

from wxPython.wx import *
def _setupContext( memory, font=None, color=None ):
        if font:
                memory.SetFont( font )
        else:
                memory.SetFont( wxNullFont )
        if color:
                memory.SetTextForeground( color )
def write( text, bitmap, pos=(0,0), font=None, color=None):
        """Simple write into a bitmap doesn't do any checking."""
        memory = wx.MemoryDC( )
        _setupContext( memory, font, color )
        memory.SelectObject( bitmap )
        try:
                memory.DrawText( text, pos[0],pos[1],)
        finally:
                memory.SelectObject( wxNullBitmap)
        return bitmap

PS:
Resize bitmap:
        start_image.Rescale(width, heght)
        bitmap=wx.BitmapFromImage(self.start_image)