我想从scrapy项目中为scrapyd创建一个自定义服务，但是我一直遇到错误。

我创建了crawler/webservice.py：

from scrapyd.webservice import WsResource


class Backintime(WsResource):
    def render_GET(self,txtrequest):
        return {
            'id': 'something works!'
        }

然后修改scrapyd.conf并在backintime.json = crawler.webservice.Backintime标签下添加行[services]。

运行命令scrapyd时出现错误：

...
  File "c:\personal\virtualenvs\crawlie\lib\site-packages\scrapyd\app.py",line 39,in application
    webservice = TCPServer(http_port,server.Site(webcls(config,app)),interface=bind_address)
  File "c:\personal\virtualenvs\crawlie\lib\site-packages\scrapyd\website.py",line 33,in __init__
    servCls = load_object(servClsname)
  File "c:\personal\virtualenvs\crawlie\lib\site-packages\scrapy\utils\misc.py",line 46,in load_object
    mod = import_module(module)
  File "C:\Users\user\Anaconda3\lib\importlib\__init__.py",line 126,in import_module
    return _bootstrap._gcd_import(name[level:],package,level)
  File "<frozen importlib._bootstrap>",line 994,in _gcd_import

  File "<frozen importlib._bootstrap>",line 971,in _find_and_load

  File "<frozen importlib._bootstrap>",line 941,in _find_and_load_unlocked

  File "<frozen importlib._bootstrap>",line 219,in _call_with_frames_removed

  File "<frozen importlib._bootstrap>",line 953,in _find_and_load_unlocked

builtins.ModuleNotFoundError: No module named 'crawler'


Failed to load application: No module named 'crawler'

尝试遵循一些以前的解决方案，但没有成功：

• https://groups.google.com/forum/#!searchin/scrapy-users/webservice/scrapy-users/czu8YeYFvao/8GDHMJbi56wJ
• How to add a new service to scrapyd from current project
• Implementing own scrapyd service

我应该如何添加新服务，以便scrapyd可以导入它？