Added part two for day four, though it's missing quite a bit of error checking.

2021/4/main2.py

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+# all the numbers called, in order
+numbers = []
+
+temp_board = []
+boards = []
+fills = []
+
+board_index = 0
+
+####
+def Victory(board):
+    for y in range(0, len(board)):
+        if(board[y] == [True, True, True, True, True]):
+            return True;
+
+    # NOTE(dev): Assumes all columns are the same length
+    for x in range(0, len(board[0])):
+        num_true = 0
+        for y in range(0, len(board)):
+            if(board[y][x]):
+                num_true = num_true + 1
+        if(num_true == len(board[0])):
+            return True
+
+    return False
+
+####
+def FindWinner(numbers):
+    indexes = []
+    winning_indexes = []
+    for i in range(0, len(boards)):
+        indexes.append(i)
+    for i in range(0, len(numbers)):
+        for board_index in range(0, len(boards)):
+            if(board_index not in winning_indexes):
+                for y in range(0, len(boards[board_index])):
+                    for x in range(0, len(boards[board_index][y])):
+                        if(boards[board_index][y][x] == numbers[i]):
+                            fills[board_index][y][x] = True
+                            if(Victory(fills[board_index])):
+                                print('Victory with', numbers[i], 'on board', board_index, '!!')
+                                winning_indexes.append(int(board_index))
+                                indexes.remove(int(board_index))
+                                if(len(indexes) == 0):
+                                    return numbers[i], board_index
+
+#### MAIN EXECUTION ####
+with open('data', 'r') as fp:
+    for i,line in enumerate(fp):
+
+        if(i == 0):
+            numbers = line.strip().split(',')
+        elif(len(line.strip()) == 0):
+            if(len(temp_board) > 0): # i.e. skip the first, empty one
+                # add in the next player board
+                boards.append(temp_board)
+                temp_board = []
+                # create a blank answer board for this player board
+                for j in range(0,5):
+                    temp_board.append([False, False, False, False, False])
+                fills.append(temp_board);
+                temp_board = []
+            board_index = board_index + 1
+        else:
+            # add the next array of numbers to the temporary board object
+            temp_board.append(line.strip().split())
+
+winning_number,winning_board_index = FindWinner(numbers)
+print('Winning Number:', winning_number, ', Winning Board Index: ', winning_board_index)
+
+total = 0
+for y in range(0, len(fills[winning_board_index])):
+    for x in range(0, len(fills[winning_board_index][y])): # assumes size is same for all columns
+        if(not fills[winning_board_index][y][x]):
+            total = total + int(boards[winning_board_index][y][x])
+
+print(total * int(winning_number))
+
+# # DEBUG(dev): Show full contents of all boards
+# for x in range(0, len(boards)):
+#     for y in range(0, len(boards[x])):
+#         for z in range(0, len(boards[x][y])):
+#             print(boards[x][y][z])