用python设计一款五子棋游戏，可以实现1、“简单”，“困难”不同难度的选择，2、分数记录，3、分数排名这三个功能。

好的，我为您提供一个简单的五子棋游戏示例。首先，我们需要定义一些变量和函数：

import random

# 定义游戏难度和对应的棋盘大小
difficulties = {
    "easy": 10,
    "hard": 15
}

# 定义玩家分数记录
scores = []

# 定义棋盘和玩家
board = None
player = None

# 定义游戏函数
def play_game():
    global board, player

    # 让用户选择游戏难度
    difficulty = input("请选择游戏难度（easy/hard）: ")
    if difficulty not in difficulties:
        print("无效的难度级别！")
        return

    # 获取棋盘大小
    size = difficulties[difficulty]

    # 初始化棋盘
    board = [[0] * size for _ in range(size)]

    # 随机选择玩家
    player = random.choice([1, 2])

    # 显示棋盘
    print_board()

    # 开始游戏
    while True:
        # 让玩家下棋
        make_move()

        # 检查游戏是否结束
        if check_game_over():
            break

        # 切换玩家
        player = 3 - player

    # 显示输赢结果并记录分数
    if check_winner() == 1:
        print("恭喜玩家1获胜！")
        scores.append(1)
    elif check_winner() == 2:
        print("恭喜玩家2获胜！")
        scores.append(2)
    else:
        print("平局！")

# 定义下棋函数
def make_move():
    global player

    while True:
        x, y = map(int, input(f"玩家{player}请下棋（x, y）: ").split(","))
        if not is_valid_move(x, y):
            print("无效的落子位置！")
        else:
            board[x-1][y-1] = player
            print_board()
            break

# 定义检查落子是否有效的函数
def is_valid_move(x, y):
    global board
    if x < 1 or x > len(board) or y < 1 or y > len(board):
        return False
    if board[x-1][y-1] != 0:
        return False
    return True

# 定义检查游戏是否结束的函数
def check_game_over():
    global board
    for row in board:
        if 0 in row:
            return False
    return True

# 定义检查胜者的函数
def check_winner():
    global board
    for i in range(len(board)):
        for j in range(len(board)):
            if i <= len(board) - 5 and board[i][j] == board[i+1][j] == board[i+2][j] == board[i+3][j] == board[i+4][j]:
                return board[i][j]
            if j <= len(board) - 5 and board[i][j] == board[i][j+1] == board[i][j+2] == board[i][j+3] == board[i][j+4]:
                return board[i][j]
            if i <= len(board) - 5 and j <= len(board) - 5 and board[i][j] == board[i+1][j+1] == board[i+2][j+2] == board[i+3][j+3] == board[i+4][j+4]:
                return board[i][j]
            if i <= len(board) - 5 and j >= 4 and board[i][j] == board[i+1][j-1] == board[i+2][j-2] == board[i+3][j-3] == board[i+4][j-4]:
                return board[i][j]
    return 0

# 定义显示棋盘的函数
def print_board():
    global board
    for row in board:
        print(" ".join(str(x) for x in row))

# 定义排行榜函数
def show_scores():
    if not scores:
        print("暂无分数记录！")
        return
    sorted_scores = sorted(scores, reverse=True)
    print("排行榜：")
    for i, score in enumerate(sorted_scores):
        print(f"{i+1}. 玩家{score}")

# 主程序
while True:
    command = input("请输入指令（play/show_scores/quit）: ")
    if command == "play":
        play_game()
    elif command == "show_scores":
        show_scores()
    elif command == "quit":
        break
    else:
        print("无效的指令！")

运行程序后，用户可以选择不同的难度级别进行游戏，下棋后会显示棋盘和当前玩家，游戏结束后会显示输赢结果并记录分数。用户也可以查看排行榜来比较自己的得分和其他玩家的得分。注意：此示例中五子棋胜负判断只考虑了横、竖、斜方向连续五子相同的情况，还有其他情况可以根据需要自行添加。