for line in lines: TypeError: 'NoneType' object is not iterable

这个错误通常是因为 `lines` 变量的值为 `None`，而 `None` 是不可迭代的。你需要检查一下 `lines` 变量的赋值语句，看看是否正确地给它赋了值。

如果你确定 `lines` 变量已经被正确地赋值了，那么可能是在之前的代码中修改了 `lines` 变量的类型，使得它不再是可迭代的类型。你可以在出错的代码行之前打印一下 `lines` 变量的值，看看它的类型是否正确。

相关问题

for line_1 in lines: TypeError: 'NoneType' object is not iterable

这个错误是因为你尝试对一个空对象进行迭代操作。在这种情况下，变量`lines`的值为`None`，而`None`类型是不可迭代的。

要解决这个问题，你可以检查一下变量`lines`的赋值部分，确保它被正确地初始化为一个可迭代的对象，例如列表或元组。另外，还要确保在使用`for`循环之前，`lines`不为`None`。

如果你能提供更多的代码或上下文信息，我可以给出更具体的建议。

File "D:/elevator_project/venv/elavator_door.py", line 29, in <module> for line in lines: TypeError: 'NoneType' object is not iterable

This error occurs when you try to iterate over a variable that has a value of `None`. In this case, it seems like the variable `lines` is not being assigned a value properly.

To resolve this error, you should check where `lines` is being assigned a value and make sure that it is not `None`. You could also add a check to ensure that `lines` has a value before trying to iterate over it. For example:

if lines is not None:
    for line in lines:
        # process each line
else:
    # handle the case where lines is None