python - 获取“NameError：名称'room_path'未定义”

Question

这是我遇到问题的代码。我正在使用 Python 3.6。

def room():
    room_path=["1","2"]
    user_choice = ""

print ("If you decide to ditch Todd and go to the campfire alone, enter 1")
print ("If you decide to drag Todd with you to the campfire, enter 2")
user_choice = input("your option number")

if user_choice == room_path [1]:
    print ("yes")
elif user_choice == room_path [2]:
    print ("no")

当我运行代码并输入一个数字时，这是我得到的错误：

    if user_choice == room_path [1]:
NameError: name 'room_path' is not defined

标签： pythonpython-3.xnameerror

Answer 1

发生错误是因为名称room_path是在函数范围内声明的 room，因此无法从该函数外部调用。

这是一个很好的链接，解释了 Python 中变量的范围：

http://python-textbok.readthedocs.io/en/1.0/Variables_and_Scope.html

要解决此问题，您可以在函数room_path之外声明room，您可能还想使用user_choice并完全删除该room函数。

您的代码将如下所示：

room_path=["1","2"]
user_choice = ""

print ("If you decide to ditch Todd and go to the campfire alone, enter 1")
print ("If you decide to drag Todd with you to the campfire, enter 2")
user_choice = input("your option number")

if user_choice == room_path [1]:
    print ("yes")
elif user_choice == room_path [2]:
    print ("no")