igordertigor commented on issue #12581:
URL: https://github.com/apache/airflow/issues/12581#issuecomment-732641724
This seems to be a dependency issue: At the end of the `pip install
apache-airflow` I noticed the following error:
```
ERROR: After October 2020 you may experience errors when installing or
updating packages. This is because pip will change the way that it resolves
dependency conflicts.
We recommend you use --use-feature=2020-resolver to test your packages with
the new resolver before it becomes the default.
cattrs 1.1.1 requires attrs>=20.1.0, but you'll have attrs 19.3.0 which is
incompatible.
marshmallow-sqlalchemy 0.24.1 requires marshmallow>=3.0.0, but you'll have
marshmallow 2.21.0 which is incompatible.
```
Manually forcing the installation by `pip install attrs==20.1.0
cattrs=1.1.1` fixes the `initdb` command, but gives a similar error (again, the
red text starts with the pip message about October 2020):
```
apache-airflow 1.10.12 requires attrs~=19.3, but you'll have attrs 20.1.0
which is incompatible.
```
However, not the commands from the quickstart work.
I tried to fix this, but the listed dependencies in `setup.cfg` list
`attrs>=20.0, <21.0`, which seems correct to me.
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