[pygtk] How to actually draw lines on gtk.Drawing Area?

[Shashank,Ankit,Amit]

Hi

I am trying to embed a canvas using gtk.DrawingArea in one of my
applications
I plan to use it to  draw lines and rectangles later on
Can anyone tell me how to draw lines or rectangles or standard shapes on
gtk.DrawingArea?

I tried the following steps

         graphical_window = gtk.ScrolledWindow()
         graphical_window.set_size_request(300,450)
         area = gtk.DrawingArea()
         area.show()
         area.set_size_request(120,120)
         drawable = area.window
         drawable.draw_line(gc,20,25,30,35)
         graphical_window.add_with_viewport(area)
         drawable.show()
         graphical_window.show()

If i do not specify or create the graphics context "gc" does it take the
default value?
Are the draw_line() and draw_rectangle() standard functions? If not, is the
remaining portion alright?

My top level widget is a window called window1 and i am trying to pack the
Drawing Area inside a Scrolled window which has been packed into window1
later on in the code

I get an error saying

  Traceback (most recent call last):
  File "E:\main.py", line 2766, in -toplevel-
    window1()
  File "E:\main.py", line 2611, in __init__
    drawable.draw_line(gc,20,25,30,35)
AttributeError: 'NoneType' object has no attribute 'draw_line'
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