ModuleNotFoundError: No module named 'cityscapesscripts.evaluation.instances2dict_with_polygons'

这个错误通常是因为你没有安装`cityscapesScripts`包或者没有将其添加到Python的搜索路径中。你可以尝试在终端中使用以下命令安装该包：

pip install cityscapesscripts

如果已经安装了该包，确保你已将其添加到Python的搜索路径中。你可以在代码中添加以下行：

import sys
sys.path.append('/path/to/cityscapesScripts/')

将`/path/to/cityscapesScripts/`替换为`cityscapesScripts`包的实际路径。

相关问题

P_Sys:POINTER TO DUT00_Sys; P_Pump:POINTER TO DUT01_Pump; P_EV:POINTER TO DUT02_EV; FB_Pump: ARRAY[0..9] OF FB01_Pump; FB_EV: ARRAY[0..9] OF FB02_EV; Link: BOOL; SIM:BOOL;解释一下这段代码

This code declares variables and data types using a programming language syntax. Here is a breakdown of what each line means:

- P_Sys: POINTER TO DUT00_Sys; This declares a pointer variable named P_Sys that will point to an instance of the data type DUT00_Sys.
- P_Pump: POINTER TO DUT01_Pump; This declares a pointer variable named P_Pump that will point to an instance of the data type DUT01_Pump.
- P_EV: POINTER TO DUT02_EV; This declares a pointer variable named P_EV that will point to an instance of the data type DUT02_EV.
- FB_Pump: ARRAY[0..9] OF FB01_Pump; This declares an array variable named FB_Pump that can store 10 instances of the data type FB01_Pump.
- FB_EV: ARRAY[0..9] OF FB02_EV; This declares an array variable named FB_EV that can store 10 instances of the data type FB02_EV.
- Link: BOOL; This declares a Boolean variable named Link that can store either a true or false value.
- SIM: BOOL; This declares another Boolean variable named SIM that can store either a true or false value.

Without more context or information about the programming language used, it's difficult to provide more specific details about what this code does.

def __new__(cls, backend=None, prefix=None, **kwargs): if backend is None and prefix is None: backend = 'disk' if backend is not None and backend not in cls._backends: raise ValueError( f'Backend {backend} is not supported. Currently supported ones' f' are {list(cls._backends.keys())}') if prefix is not None and prefix not in cls._prefix_to_backends: raise ValueError( f'prefix {prefix} is not supported. Currently supported ones ' f'are {list(cls._prefix_to_backends.keys())}') # concatenate the arguments to a unique key for determining whether # objects with the same arguments were created arg_key = f'{backend}:{prefix}' for key, value in kwargs.items(): arg_key += f':{key}:{value}' if arg_key in cls._instances: _instance = cls._instances[arg_key] else: # create a new object and put it to _instance _instance = super().__new__(cls) if backend is not None: _instance.client = cls._backends[backend](**kwargs) else: _instance.client = cls._prefix_to_backends[prefix](**kwargs) cls._instances[arg_key] = _instance return _instance

这段代码是 Python 中的一个类的构造方法 __new__，它用于创建一个新对象并返回它。这个类接受三个参数：backend、prefix 和 **kwargs。如果 backend 和 prefix 都没有被指定，则默认使用 disk 作为 backend。如果指定的 backend 或 prefix 不在 _backends 或 _prefix_to_backends 中，则会引发一个 ValueError 异常。这个类会将所有的参数拼接成一个唯一的 key，用于判断是否已经创建了具有相同参数的对象。如果已经创建了这样的对象，则返回已有的对象；否则，创建一个新对象并将其存储到 _instances 中。根据参数指定的 backend 或 prefix，创建一个新的 client 对象，并将其赋值给新创建的实例对象的 client 属性。最后，返回新创建的对象。