mouse handling

#Mouse Handling using Tkinter

A minimal mouse handling script, clearly using tkinter. Clumsily importing *

```python
from tkinter import *

#Globals
lastx, lasty = 0, 0

#Definitions
def xy(event):
    global lastx, lasty
    lastx, lasty = event.x, event.y

def addLine(event):
    global lastx, lasty
    canvas.create_line((lastx, lasty, event.x, event.y))
    lastx, lasty = event.x, event.y

#Create a top level object
window = Tk()

#Canvas Create + Setup
canvas = Canvas(root)
canvas.grid(column=0, row=0, sticky=(N, W, E, S))
canvas.bind("<Button-1>", xy)
canvas.bind("<B1-Motion>", addLine)

#Main Loop
window.mainloop()
```