Sizing canvas in IDLE

import sys

if '2' == sys.version[0]:
    import Tkinter as tkinter
else:
    import tkinter

root = tkinter.Tk()
canvas = tkinter.Canvas(root,width=400,height=100)
canvas.pack()
y = 100
scroll = canvas.create_text(0,y,anchor=tkinter.NW,text="""$ python3 q.py
Traceback (most recent call last):
  File "q.py", line 12, in <module>
    scroll.pack(tkinter.BOTTOM)
  File "/usr/lib/python3.2/tkinter/__init__.py", line 1819, in pack_configure
    + self._options(cnf, kw))
  File "/usr/lib/python3.2/tkinter/__init__.py", line 1066, in _options
    for k, v in cnf.items():
AttributeError: 'str' object has no attribute 'items'""")

def f(*args,**kwargs):
    global y
    y -= 1
    canvas.coords(scroll,0,y)
    if y < -160:
        root.destroy()
    else:
        canvas.after(20,f)

canvas.after(40,f)

root.mainloop()