I'm new to Python and I'm making my own chess game to help learn it. I know this topic has been covered a lot, but I don't understand how to apply the answers I've found to my specific situation.
Here's a very basic overview of the problem:
class blank:
def __init__(self,row,col):
self.row = row
self.col = col
def __str__(self):
return '.'
class pawn:
def __init__(self,row,col):
self.row = row
self.col = col
def __str__(self):
return 'p'
def addpiece(brd,tr,tc):
nb = brd
nb[tr][tc] = pawn(tr,tc)
return nb
original_board = [[blank(rr,cc) for rr in range(8)] for cc in range(8)]
for row1 in original_board: print(' '.join([str(elem) for elem in row1]))
print('=====\n')
new_board = addpiece(original_board,1,1)
for row2 in original_board: print(' '.join([str(elem) for elem in row2]))
Each piece type (and a blank square) is a class; the board is a list of lists. If I want to see if a potential move will put the player in check, I made duplicate board (new_board), so the original_board variable is supposed to stay the same for the moment. I change one of the squares in the new_board (e.g., put a pawn in the middle), but the original_board variable changes anyway.
I know the problem has something to do with the variable ID following original_board into the function and assigning it to the dummy variable nb. I suppose I could change the original_board to a tuple of tuples and then change it back afterwards, but that doesn't seem very elegant. Any suggestions? Thanks.
