from graph import *
def move(h, v):
 global x, y
 x, y = x+h, x+v
 if x > 270:
  x = 0
 if x < 0:
  x = 270
 if y > 270:
  y = 0
 if y < 0:
  y = 270
 can.coords(rond, x, y, x+30, y+30)
 
x, y = 0, 0
fen= Tk()
fen.title("Le petit bonhomme" )
can=Canvas(fen, bg="grey", height=300, width=300)
rond=can.create_oval(x, y, x+30, y+30, width=2, fill="blue" )
can.bind("z", move(-10, 0))
can.bind("q", move(0, -10))
can.bind("d", move(0, 10))
can.bind("s", move(10, 0))
can.grid(row=0, column=0)
fen.mainloop()

from graph import *
def movez(event):
 move(-10, 0)
 
def moveq(event):
 move(0, -10)
 
def moved(event):
 move(0, 10)
 
def moves(event):
 move(10, 0)
 
def move(h, v):
 global x, y
 x, y = x+h, x+v
 if x > 270:
  x = 0
 if x < 0:
  x = 270
 if y > 270:
  y = 0
 if y < 0:
  y = 270
 can.coords(rond, x, y, x+30, y+30)
 
x, y = 0, 0
fen= Tk()
fen.title("Le petit bonhomme" )
can=Canvas(fen, bg="grey", height=300, width=300)
rond=can.create_oval(x, y, x+30, y+30, width=2, fill="blue" )
can.bind("z", movez)
can.bind("q", moveq)
can.bind("d", moved)
can.bind("s", moves)
can.grid(row=0, column=0)
fen.mainloop()

The form of the bind method is:  
 

 
where:  
 
sequence  
is a string that denotes the target kind of event. (See the bind man page and page 201 of John Ousterhout's book for details).  
 
func  
is a Python function, taking one argument, to be invoked when the event occurs. An Event instance will be passed as the argument. (Functions deployed this way are commonly known as callbacks.)  
 
add  
is optional, either "" or "+". Passing an empty string denotes that this binding is to replace any other bindings that this event is associated with. Preceeding with a "+" means that this function is to be added to the list of functions bound to this event type.  
For example: