Strange stacked range() loop behavior python

(x,y) = 10,10  
for x in range(x-1,x+2):
      for y in range(y-1,y+2):
             print(x,y)

My results… The Y value seems to be increasing each loop it should be 9,10,11 every time.

9 9
9 10
9 11
10 10
10 11
10 12
11 11
11 12
11 13

I have no idea whats causing this. How can I get the desired effect?

>Solution :

#!/usr/bin/env python3
(x,y) = 10,10
for X in range(x-1,x+2):
      for Y in range(y-1,y+2):
             print(X,Y)

The behaviour has to do with you re-assigning the y variable within your loop. Changing the variables assigned at for: to anything else has given me the behaviour you want:

9 9
9 10
9 11
10 9
10 10
10 11
11 9
11 10
11 11