Hartismere School

Est. 1451. An outstanding coeducational secondary school & sixth form college and England's first academy

Home Login

Computerphile Sudoku Python

grid = [
       [ 5, 0, 0, 1, 0, 0, 7, 0, 0 ],
       [ 0, 2, 0, 0, 0, 7, 1, 0, 0 ],
       [ 3, 0, 1, 4, 0, 0, 8, 5, 2 ],
       [ 6, 1, 0, 5, 7, 2, 4, 0, 8 ],
       [ 0, 0, 2, 9, 6, 0, 0, 0, 0 ],
       [ 0, 4, 0, 0, 3, 0, 6, 2, 7 ],
       [ 4, 5, 9, 0, 8, 0, 0, 7, 0 ],
       [ 1, 3, 0, 0, 0, 0, 9, 8, 6 ],
       [ 2, 0, 0, 0, 1, 0, 0, 4, 3 ]
   ]
   
def possible(y,x,n):
   for i in range(0,9):
       if grid[y][i] == n:
           return False
   for i in range(0,9):
       if grid[i][x] == n:
           return False
   x0 = (x//3)*3
   y0 = (y//3)*3
   for i in range(0,3):
       for j in range(0,3):
           if grid[y0+i][x0+j] == n:
               return False
   return True
   
def solve():
   print("solving")
   for y in range(9):
       for x in range(9):
           if grid[y][x] == 0:
               for n in range(1,10):
                   if possible(y,x,n):
                       grid[y][x] = n
                       solve()
                       grid[y][x] = 0
               return
   printGrid()
   input()
   
def printGrid() : 
   for n in range(0,9):
       print(grid[n])
       
solve()

Documents

Explore...

Toyota Virtual Plant Tour

Taking A Level Computer Science

Captain Fantastic Movie CLIP - Lovebirds (2016) - Missi Pyle Movie

Do The Right Thing BTS - Part 3 (1989) A Spike Lee Joint Movie HD

CPU Fetch-Decode-Execute Animation

Sarah Polley on Stories We Tell | Film Independent at LACMA

Binary addition 1

Online Little Man Computer - CPU simulator

Microbit Multiplayer Game // Maverick

Crash Course: Do the Right Thing

New...

Local Governing Body Information

Book a tour... appointments for 2025 - 2026 academic year will be available soon

University and careers; destinations & retention

Hartismere Bursary Criteria

GCSE CS: 1.5 Networks - TCP/IP Layers and Protocols

Academic challenge and independence; attainment

Hartismere Sixth Form College

E-Safety

Discover...

Python Programming Computerphile Videos Computer Science GCSE CS Girls LMC Physics Algorithms Enrichment Just For Fun A Level CPU College Governor A Levels Microbit Website Key Stage 3 Film Independent

Uh-oh - we were unable to load our website on your browser so we're showing you a plain HTML version.

We use many features found in modern browsers and regrettably yours seems incompatible.

However this legacy version contains (very, very nearly) all the same content. Each page is rendered on our server and doesn't rely on any browser features except the odd font. It doesn't even need Javascript or fancy CSS. It's like being in 1995!

Your browser is reporting itself to us as Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com). Please consider updating your browser to make the most of our website.

If you would like to try our proper website again - you can do so here...