A wx.ClientDC must be constructed if an application wishes to paint on the client area of a window from outside an EVT_PAINT() handler.
This should normally be constructed as a temporary stack object; don’t store a wx.ClientDC object.
To draw on a window from within an EVT_PAINT() handler, construct a wx.PaintDC object instead.
To draw on the whole window including decorations, construct a wx.WindowDC object (Windows only).
A wx.ClientDC object is initialized to use the same font and colours as the window it is associated with.
See also