[BUG] Cannot run debug=True when sub classing html or dcc components #1285
Description
python 3.7.7
dash 1.11.0
dash-core-components 1.9.1
dash-html-components 1.0.3
dash-renderer 01.4.0
dash-table 4.6.2
Whenever I try to subclass a component I cannot use the app in debug mode.
Unfortunately it becomes unusable without debug mode when developing.
This is the full traceback
Traceback (most recent call last):
File "C:\Users\gioxc\AppData\Local\Programs\Python\Python37\lib\pkgutil.py", line 493, in find_loader
spec = importlib.util.find_spec(fullname)
File "C:\Users\gioxc\AppData\Local\Programs\Python\Python37\lib\importlib\util.py", line 114, in find_spec
raise ValueError('{}.__spec__ is None'.format(name))
ValueError: __main__.__spec__ is None
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "apptest.py", line 108, in <module>
app.run_server(debug=True)
File "C:\Users\gioxc\AppData\Local\Programs\Python\Python37\lib\site-packages\dash\dash.py", line 1475, in run_server
dev_tools_prune_errors,
File "C:\Users\gioxc\AppData\Local\Programs\Python\Python37\lib\site-packages\dash\dash.py", line 1282, in enable_dev_tools
for x in list(ComponentRegistry.registry) + ["dash_renderer"]
File "C:\Users\gioxc\AppData\Local\Programs\Python\Python37\lib\site-packages\dash\dash.py", line 1277, in <listcomp>
os.path.dirname(package.path)
File "C:\Users\gioxc\AppData\Local\Programs\Python\Python37\lib\site-packages\dash\dash.py", line 1282, in <genexpr>
for x in list(ComponentRegistry.registry) + ["dash_renderer"]
File "C:\Users\gioxc\AppData\Local\Programs\Python\Python37\lib\pkgutil.py", line 499, in find_loader
raise ImportError(msg.format(fullname, type(ex), ex)) from ex
ImportError: Error while finding loader for '__main__' (<class 'ValueError'>: __main__.__spec__ is None)