python - codecademy战舰项目语法错误

Question

我正在通过 codeacademy 网站学习 python。现在我正在尝试编写战舰项目的代码，但我遇到了一个问题:我的代码是:

import random

board = []

for x in range(0,5):
  board.append(["O"] * 5)

def print_board(board):
  for row in board:
    print " ".join(row)

print_board(board)

def random_row(board):
  return random.randint(0,len(board)-1)

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

ship_row = random_row(board)
ship_col = random_col(board)
guess_row = input("Guess Row:")
guess_col = input("Guess Col:")

print ship_row
print ship_col

if (guess_row == ship_row and guess_col == ship_col):
    print "Congratulations! You sank my battleship!"
else:
    if((guess_row < 0) or (guess_row > (len(board) -1) or (guess_col < 0) or (guess_col> (len(board) -1)):
        print "Oops, that’s not even in the ocean."
    else:
        print "You missed my battleship!"
        guess_row = "X"
        guess_col = "X"
        print_board(board)
    if board[guess_row][guess_col] == "X":
        print "You guessed that one already."

但它返回这个错误:

    if((guess_row < 0) or (guess_row > (len(board) -1) or (guess_col < 0) or (guess_col> (len(board) -1)):
                                                                                                         ^
SyntaxError: invalid syntax

你能帮我解决这个问题吗？

先谢谢大家

Answer 1

您有 9 个左括号，但只有 7 个右括号。

我个人会删除其中的大部分:

 if guess_row < 0 or guess_row >= len(board) or guess_col < 0 or guess_col >= len(board):

或者，更好的是:

 if not (0 <= guess_row < len(board)) or not (0 <= guess_col < len(board)):

此处，not 后的两对括号不是必需的，但 IMO 提高了可读性。如果您不同意，请随意删除它们。

代码还有一些其他问题。

以下内容:

    guess_row = "X"
    guess_col = "X"

可能应该阅读

    board[guess_row][guess_col] = "X"

此外，if board[guess_row][guess_col] == "X": 检查应该在设置 board[guess_row][guess_col] 之前完成或代替设置为当前 guess_row 和 guess_col 的 "X"。