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  1. col = []
  2. mapGrid = []
  3.  
  4. for x in range(0,3):
  5.     col += "#"
  6.  
  7. for y in range(0,3):
  8.     mapGrid.append(col) # you append the same list several times
  9.  
  10. print(mapGrid)
  11. mapGrid[1][1] = 'c'
  12. print(mapGrid) # oh my :O
  13. #instead do 
  14. print("##################")
  15.  
  16. col = []
  17. mapGrid = []
  18.  
  19. for x in range(0,3):
  20.     col += "#"
  21.  
  22. for y in range(0,3):
  23.     mapGrid.append(col[:]) # a copy of col
  24.  
  25. print(mapGrid)
  26. mapGrid[1][1] = 'c'
  27. print(mapGrid) # OK
Success #stdin #stdout 0.03s 8736KB
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stdin
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Standard input is empty
stdout
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[['#', '#', '#'], ['#', '#', '#'], ['#', '#', '#']]
[['#', 'c', '#'], ['#', 'c', '#'], ['#', 'c', '#']]
##################
[['#', '#', '#'], ['#', '#', '#'], ['#', '#', '#']]
[['#', '#', '#'], ['#', 'c', '#'], ['#', '#', '#']]
https://ideone.com/tVDQG3
language:
Python 3 (python  3.12)
created:
10 years ago
visibility:
public

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