codecademy_python_Battleship!

from random import randint   #用来产生随机数

board = []

for x in range(5):
    board.append(["O"] * 5)    #  ['O'] * 5 即['O','O','O','O','O']  ，对board列表append5次这个O列表，执行完之后board就变成了一个5x5的列表

def print_board(board):
    for row in board:
        print " ".join(row)   #the .join method uses the string to combine the items in the list.  打印出来效果就是O O O O O

print "Let's play Battleship!"
print_board(board)

def random_row(board):
    return randint(0, len(board) - 1)  #含头尾

def random_col(board):
    return randint(0, len(board[0]) - 1)

ship_row = random_row(board)
ship_col = random_col(board)
print ship_row
print ship_col

# Everything from here on should go in your for loop!
# Be sure to indent four spaces!
for turn in range(4):
    print 'Turn',turn + 1
    guess_row = int(raw_input("Guess Row:"))
    guess_col = int(raw_input("Guess Col:"))
    
    if guess_row == ship_row and guess_col == ship_col:  
        print "Congratulations! You sunk my battleship!"   #猜对的话打印，然后break，停止guess
        break
    else:
        print turn + 1          #如果猜错，统计错误的次数，满4次则gameover
        
        if (guess_row < 0 or guess_row > 4) or (guess_col < 0 or guess_col > 4):   #超出范围
            print "Oops, that's not even in the ocean."
        elif(board[guess_row][guess_col] == "X"):       
            print "You guessed that one already."     #如果该位置已经是"X"，则表明已经猜过，提示you guessed that one already
        else:
            print "You missed my battleship!"           #没有超出范围，则将所猜的位置变为"X"
            board[guess_row][guess_col] = "X"
        
        if (turn == 3): 
            print "Game Over"        #错误满4次
            
            
        print_board(board)       #每轮循环结束之后都打印一下board，更新一下值为"X"的位置