python_class/Connect_Four_2.py at Matrix · harinivbaskar/python_class · GitHub

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#==================================================================
# Global Variables
#==================================================================

# this module lets the "coins" be colorful
from colorama import Fore

# this is the list containing the full board
board = [
    ["_", "_", "_", "_", "_", "_", "_"],
    ["_", "_", "_", "_", "_", "_", "_"],
    ["_", "_", "_", "_", "_", "_", "_"],
    ["_", "_", "_", "_", "_", "_", "_"],
    ["_", "_", "_", "_", "_", "_", "_"],
    ["_", "_", "_", "_", "_", "_", "_"]
]


player = ""

#==================================================================
# Functions
#==================================================================

# If the player is R then the color will be red. If the character isn't, then the color will be yellow
def set_color(player):
    return Fore.RED if player == 'R' else Fore.YELLOW

# this will display the board in the terminal
def display_board(board):
    for row in board:
        row_str = "', '".join([f"{set_color(i)}{i}{Fore.RESET}" if i != "_" else i for i in row ])
        print(f"[' {row_str} ']")

def get_column(player):
    while True:
        try:
            column = int(input(f"Player '{set_color(player)}{player}{Fore.RESET}' - Choose a column to drop your coin in [0-6]: "))
            if not 0 <= column <= 6:
                print("ERROR: Invalid input")
            else:
                return column
        except ValueError:
            print("ERROR: Invalid input")

# check if column is full
def check_column_full(board, column):
    if board[0][column] != "_":
        print(f"ERROR: Column '{column}' is full")
        return True
    else:
        return False

def check_board_full(board):
    isFull = True

    for row in board:
        if "_" in row:
            isFull = False
            break

    return isFull

def drop_coin(board, player):
    # check if the board is full
    if check_board_full(board):
        # says it's a draw
        print("It's a draw!")
        exit()

    # get valid column that is not full
    column = get_column(player)

    while check_column_full(board, column):
        column = get_column(player)

    # drop coin
    for row in board[-1::-1]:
        if row[column] == "_":
            row[column] = player
            break

# switch to next player
def next_player(player):
    if player == "" or player == 'Y':
        player = 'R'
    else:
        player = 'Y'

    return player

def check_virtual_board_4x4(board_4x4):
    # check rows
    if board_4x4[0][0] != "_" and board_4x4[0][0] == board_4x4[0][1] == board_4x4[0][2] == board_4x4[0][3]:
        return board_4x4[0][0]
    elif board_4x4[1][0] != "_" and board_4x4[1][0] == board_4x4[1][1] == board_4x4[1][2] == board_4x4[1][3]:
        return board_4x4[1][0]
    elif board_4x4[2][0] != "_" and board_4x4[2][0] == board_4x4[2][1] == board_4x4[2][2] == board_4x4[2][3]:
        return board_4x4[2][0]
    elif board_4x4[3][0] != "_" and board_4x4[3][0] == board_4x4[3][1] == board_4x4[3][2] == board_4x4[3][3]:
        return board_4x4[3][0]

    # check columns
    elif board_4x4[0][0] != "_" and board_4x4[0][0] == board_4x4[1][0] == board_4x4[2][0] == board_4x4[3][0]:
        return board_4x4[0][0]
    elif board_4x4[0][1] != "_" and board_4x4[0][1] == board_4x4[1][1] == board_4x4[2][1] == board_4x4[3][1]:
        return board_4x4[0][1]
    elif board_4x4[0][2] != "_" and board_4x4[0][2] == board_4x4[1][2] == board_4x4[2][2] == board_4x4[3][2]:
        return board_4x4[0][2]
    elif board_4x4[0][3] != "_" and board_4x4[0][3] == board_4x4[1][3] == board_4x4[2][3] == board_4x4[3][3]:
        return board_4x4[0][3]

    # check diagonals
    elif board_4x4[0][0] != "_" and board_4x4[0][0] == board_4x4[1][1] == board_4x4[2][2] == board_4x4[3][3]:
        return board_4x4[0][0]
    elif board_4x4[3][0] != "_" and board_4x4[3][0] == board_4x4[2][1] == board_4x4[1][2] == board_4x4[0][3]:
        return board_4x4[3][0]

    else:
        return None


def check_winner(board):
    slice_row_start = 0

    # process block of 4 rows
    board_4x4 = []
    while slice_row_start + 4 <= len(board):
        # process block of 4 columns
        slice_column_start = 0
        while slice_column_start + 4 <= len(board[0]):
            # process rows and create virtual board
            for row in board[slice_row_start:slice_row_start + 4]:
                board_4x4.append(row[slice_column_start:slice_column_start + 4])

            # check virtual board for winner
            winner = check_virtual_board_4x4(board_4x4)

            if winner:
                return winner

            board_4x4 = []

            # increment slice_column_start
            slice_column_start += 1

        # increment slice_row_start
        slice_row_start += 1

    return None

#==================================================================
# Main Program
#==================================================================

# display the board
display_board(board)

winner = check_winner(board)

while not winner:
    # drop the red coin
    player = next_player(player)
    drop_coin(board, player)

    # display the board
    display_board(board)

    winner = check_winner(board)

# display winner
if winner:
    print(f"The winner is {set_color(player)}{player}{Fore.RESET}!")