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Task/Flipping-bits-game/Python/flipping-bits-game.py

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+"""
+Given a %i by %i sqare array of zeroes or ones in an initial
+configuration, and a target configuration of zeroes and ones
+The task is to transform one to the other in as few moves as
+possible by inverting whole numbered rows or whole lettered
+columns at once.
+In an inversion any 1 becomes 0 and any 0 becomes 1 for that
+whole row or column.
+
+"""
+
+from random import randrange
+from copy import deepcopy
+from string import ascii_lowercase
+
+
+try:    # 2to3 fix
+    input = raw_input
+except:
+    pass
+
+N = 3   # N x N Square arrray
+
+board  = [[0]* N for i in range(N)]
+
+def setbits(board, count=1):
+    for i in range(count):
+        board[randrange(N)][randrange(N)] ^= 1
+
+def shuffle(board, count=1):
+    for i in range(count):
+        if randrange(0, 2):
+            fliprow(randrange(N))
+        else:
+            flipcol(randrange(N))
+
+
+def pr(board, comment=''):
+    print(str(comment))
+    print('     ' + ' '.join(ascii_lowercase[i] for i in range(N)))
+    print('  ' + '\n  '.join(' '.join(['%2s' % j] + [str(i) for i in line])
+                             for j, line in enumerate(board, 1)))
+
+def init(board):
+    setbits(board, count=randrange(N)+1)
+    target = deepcopy(board)
+    while board == target:
+        shuffle(board, count=2 * N)
+    prompt = '  X, T, or 1-%i / %s-%s to flip: ' % (N, ascii_lowercase[0],
+                                                    ascii_lowercase[N-1])
+    return target, prompt
+
+def fliprow(i):
+    board[i-1][:] = [x ^ 1 for x in board[i-1] ]
+
+def flipcol(i):
+    for row in board:
+        row[i] ^= 1
+
+if __name__ == '__main__':
+    print(__doc__ % (N, N))
+    target, prompt = init(board)
+    pr(target, 'Target configuration is:')
+    print('')
+    turns = 0
+    while board != target:
+        turns += 1
+        pr(board, '%i:' % turns)
+        ans = input(prompt).strip()
+        if (len(ans) == 1
+            and ans in ascii_lowercase and ascii_lowercase.index(ans) < N):
+            flipcol(ascii_lowercase.index(ans))
+        elif ans and all(ch in '0123456789' for ch in ans) and 1 <= int(ans) <= N:
+            fliprow(int(ans))
+        elif ans == 'T':
+            pr(target, 'Target configuration is:')
+            turns -= 1
+        elif ans == 'X':
+            break
+        else:
+            print("  I don't understand %r... Try again. "
+                  "(X to exit or T to show target)\n" % ans[:9])
+            turns -= 1
+    else:
+        print('\nWell done!\nBye.')