如何判断列表中“H”的出现次数及其在Python中的应用

玩家正在开发一个简单的战舰游戏。游戏开始时，玩家和敌方阵营各有两艘船。当任一方的两艘船都被击中时，游戏结束。玩家正在使用Python进行开发，并希望能够统计敌方阵营被击中的船只数量。然而，目前的问题是，玩家不知道如何统计列表中“H”的出现次数。

2. 解决方案：
   为了统计列表中“H”的出现次数，玩家可以使用Python的count()方法。该方法可以接受一个指定的值作为参数，并返回该值在列表中出现的次数。例如，以下代码将统计列表enemy_grid中“H”的出现次数：

   num_hits = enemy_grid.count("H")
   

   现在，玩家可以使用num_hits来判断游戏是否结束。如果num_hits等于2，则表示敌方阵营的两艘船都被击中，游戏结束。

以下是一个完整的代码示例：

def enemy_board():
    global enemy_grid
    enemy_grid = []
    for i in range(0, 10):
        enemy_grid.append(["="] * 10)


def random_row_one(enemy_grid):
    return randint(0, len(enemy_grid) - 1)


def random_col_one(enemy_grid):
    return randint(0, len(enemy_grid) - 1)


def random_row_two(enemy_grid):
    return randint(0, len(enemy_grid) - 1)


def random_col_two(enemy_grid):
    return randint(0, len(enemy_grid) - 1)


global x_one
x_one = random_row_one(enemy_grid)
global y_one
y_one = random_col_one(enemy_grid)
global x_two
x_two = random_row_two(enemy_grid)
global y_two
y_two = random_col_two(enemy_grid)


def my_board():
    global my_grid
    my_grid = []
    for i in range(0, 10):
        my_grid.append(["O"] * 10)


def my_row_one(my_grid):
    int(input("Where do you wish to position your first ship on the x-axis? "))


def my_col_one(my_grid):
    int(input("Where do you wish to position your first ship on the y-axis? "))


global x_mio
x_mio = my_row_one(my_grid)
global y_mio
y_mio = my_col_one(my_grid)


def my_row_two(my_grid):
    int(input("\nWhere do you wish to position your other ship on the x-axis? "))


def my_col_two(my_grid):
    int(input("Where do you wish to position your other ship on the y-axis? "))


global x_mit
x_mit = my_row_two(my_grid)
global y_mit
y_mit = my_col_two(my_grid)


title()
my_board()
enemy_board()
m = 20
guesses = m
while guesses > 0:

    def printmi_board(my_grid):
        for row in my_grid:
            print(" ".join(row))

    def printyu_board(enemy_grid):
        for row in enemy_grid:
            print(" ".join(row))

    print(printmi_board(my_grid))
    print(printyu_board(enemy_grid))
    try:
        guess_x = int(input("Take aim at the x-xalue: "))
    except ValueError:
        print("\nI SAID TAKE AIM!\n")
        guess_x = int(input("Take aim at the x-xalue: "))
    try:
        guess_y = int(input("Take aim at the y-value: "))
    except ValueError:
        print("\nDo you have wax in your ears?? AIM!\n")
        guess_y = int(input("Take aim at the y-value: "))
    comp_x = randint(0, len(my_grid) - 1)
    comp_y = randint(0, len(my_grid) - 1)
    if x_one == guess_x and y_one == guess_y:
        print("\nYou hit one! \n")
        enemy_grid[guess_x - 1][guess_y - 1] = "H"
        continue
    elif x_two == guess_x and y_two == guess_y:
        enemy_grid[guess_x - 1][guess_y - 1] = "H"
        print("\nYou hit one! \n")
        continue
    elif enemy_grid[guess_x - 1][guess_y - 1] == "O":
        print("\nYou've tried there before! Here's another round.\n")
        print("You have " + str(guesses) + " rounds left, cadet.\n\n")
        continue
    elif enemy_grid.count("H") == 2:
        print("\nYou got them all!\n")
        break
    else:
        if guess_x not in range(10) or guess_y not in range(10):
            print("\nThat's not even in the OCEAN!! Take another free round then.\n")
            print("You have " + str(guesses) + " rounds left, cadet.\n\n")
            continue
        elif enemy_grid[guess_x][guess_y] == "O":
            print("\nYou've tried there before! Here's another round.\n")
            print("You have " + str(guesses) + " rounds left, cadet.\n\n")
            continue
        else:
            print("\nYou missed, soldier!\n")
            guesses = guesses - 1
            print("You have " + str(guesses) + " rounds left, cadet.\n\n")
            enemy_grid[guess_x - 1][guess_y - 1] = "O"
            if comp_x == x_mio and comp_y == y_mio:
                my_grid[comp_x - 1][comp_y - 1] = "H"
                print("\nThe enemy hit you! \n")
                continue
            elif comp_x == x_mit and comp_y == y_mit:
                my_grid[comp_x - 1][comp_y - 1] = "H"
                print("\nThe enemy hit you! \n")
                continue
            elif my_grid.count("H") == 2:
                print("We have to retreat! They've sunken all of your ships...")
                break
            else:
                my_grid[comp_x - 1][comp_y - 1] = "="
                continue