oscarostlundgs opened a new issue #9589:
URL: https://github.com/apache/incubator-superset/issues/9589
`models/core.py` and `db_engine_specs/base.py` both try to import
each-other.
### Expected results
This is happening when starting`celery` which loads `sql_lab.py`. This used
to work with 0.35.2.
#### Logs
```
...
File "/home/superset/venv/lib/python3.7/site-packages/superset/sql_lab.py",
line 43, in <module>
from superset.db_engine_specs import BaseEngineSpec
File
"/home/superset/venv/lib/python3.7/site-packages/superset/db_engine_specs/__init__.py",
line 36, in <module>
from superset.db_engine_specs.base import BaseEngineSpec
File
"/home/superset/venv/lib/python3.7/site-packages/superset/db_engine_specs/base.py",
line 54, in <module>
from superset.models.sql_lab import Query
File
"/home/superset/venv/lib/python3.7/site-packages/superset/models/__init__.py",
line 17, in <module>
from . import core, datasource_access_request, schedules, sql_lab,
user_attributes
File
"/home/superset/venv/lib/python3.7/site-packages/superset/models/core.py", line
55, in <module>
from superset.db_engine_specs.base import TimeGrain
ImportError: cannot import name 'TimeGrain' from
'superset.db_engine_specs.base'
(/home/superset/venv/lib/python3.7/site-packages/superset/db_engine_specs/base.py)
```
#### How to reproduce the bug
Run `celery flower --app=superset.sql_lab:celery_app`
### Environment
(please complete the following information):
- superset version: 0.36.0
- python version: 3.7
### Checklist
Make sure these boxes are checked before submitting your issue - thank you!
- [x] I have checked the superset logs for python stacktraces and included
it here as text if there are any.
- [x] I have reproduced the issue with at least the latest released version
of superset.
- [x] I have checked the issue tracker for the same issue and I haven't
found one similar.
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