python - NameError:方向未定义？

Question

所以我是第一年，有一点编码经验，但不多，我被赋予了制作基于文本的冒险游戏的任务。我的讲师给了我们一个模板并帮助我们开始，但我很困惑为什么这段代码会导致 shell 显示 NameError: name 'direction' is not Defined。有人可以帮助第一年吗？

def print_menu_line(direction, leads_to):
    """This function prints a line of a menu of exits. It takes two strings: a
    direction (the name of an exit) and the name of the room into which it
    leads (leads_to), and should print a menu line in the following format:

    Go <EXIT NAME UPPERCASE> to <where it leads>.

    For example:
    >>> print_menu_line("east", "you personal tutor's office")
    Go EAST to you personal tutor's office.
    >>> print_menu_line("south", "MJ and Simon's room")
    Go SOUTH to MJ and Simon's room."""

    print(rooms[room_livingRoom["exits"]])
    direction = input("Which direction? ")
    leads_to = input("Where do you want to go? ")
    print("Go", direction, "to", leads_to)

    print_menu_line(direction, leads_to)

Answer 1

您粘贴的代码中有一些错误。这是我认为您的讲师给您的代码。

def print_menu_line(direction, leads_to):
    """This function prints a line of a menu of exits. It takes two strings: a
       direction (the name of an exit) and the name of the room into which it
       leads (leads_to), and should print a menu line in the following format:

       Go <EXIT NAME UPPERCASE> to <where it leads>.

     For example:
     >>> print_menu_line("east", "you personal tutor's office")
      Go EAST to you personal tutor's office.
     >>> print_menu_line("south", "MJ and Simon's room")
     Go SOUTH to MJ and Simon's room."""


#print (rooms[room_livingRoom["exits"]])
direction = input("Which direction? ")
leads_to = input("Where do you want to go? ")
print("Go", direction, "to", leads_to)

print_menu_line(direction, leads_to)

现在，这是您问题的解决方案:

def print_menu_line(direction, leads_to):
    """ direction and leads_to are the parameters of the function """
    direction = direction.upper() # to have a upper case 
    print("Go", direction, "to", leads_to)


# to get values <direction> and <leads_to>
# direction and lead_to are the arguments you will send to the function
direction = input("Which direction? ")
leads_to = input("Where do you want to go? ")

# call the function
print_menu_line(direction, leads_to)

更新:为了理解参数和参数之间的区别，我重写了顶部的代码:

def print_menu_line(param1, param2):
    """ param1 and param2 are the parameters of the function. From your assignment, you know that param1 refers to the direction and param2 refers to the leads_to variable """

    param1 = param1.upper() # to have a upper case 
    print("Go", param1, "to", param2)


# direction and lead_to are the arguments you will send to the function
direction = input("Which direction? ")
leads_to = input("Where do you want to go? ")