Zat42 opened a new issue #12877:
URL: https://github.com/apache/airflow/issues/12877
**Apache Airflow version**: 1.10.3
**Environment**:
- **OS** (e.g. from /etc/os-release): Arch Linux
- **Kernel** (e.g. `uname -a`): Linux 5.9.11-arch2-1 #1 SMP PREEMPT Sat, 28
Nov 2020 02:07:22 +0000 x86_64 GNU/Linux
- **Install tools**: pip 2.3.1 (with _--use-deprecated legacy-resolver_)
- **Others**: python 3.9
**What happened**:
```
(env) ➜ project-airflow git:(feature-implementation) ✗ ./env/bin/airflow
webserver
Traceback (most recent call last):
File "/home/user/dev/project-airflow/./env/bin/airflow", line 26, in
<module>
from airflow.bin.cli import CLIFactory
File
"/home/user/dev/project-airflow/env/lib/python3.9/site-packages/airflow/bin/cli.py",
line 95, in <module>
api_module = import_module(conf.get('cli', 'api_client')) # type: Any
File "/usr/lib/python3.9/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File
"/home/user/dev/project-airflow/env/lib/python3.9/site-packages/airflow/api/client/local_client.py",
line 24, in <module>
from airflow.api.common.experimental import delete_dag
File
"/home/user/dev/project-airflow/env/lib/python3.9/site-packages/airflow/api/common/experimental/delete_dag.py",
line 26, in <module>
from airflow.models.serialized_dag import SerializedDagModel
File
"/home/user/dev/project-airflow/env/lib/python3.9/site-packages/airflow/models/serialized_dag.py",
line 35, in <module>
from airflow.serialization.serialized_objects import SerializedDAG
File
"/home/user/dev/project-airflow/env/lib/python3.9/site-packages/airflow/serialization/serialized_objects.py",
line 28, in <module>
import cattr
File
"/home/user/dev/project-airflow/env/lib/python3.9/site-packages/cattr/__init__.py",
line 2, in <module>
from .converters import Converter, UnstructureStrategy
File
"/home/user/dev/project-airflow/env/lib/python3.9/site-packages/cattr/converters.py",
line 15, in <module>
from ._compat import (
File
"/home/user/dev/project-airflow/env/lib/python3.9/site-packages/cattr/_compat.py",
line 87, in <module>
from typing import _Union
ImportError: cannot import name '_Union' from 'typing'
(/usr/lib/python3.9/typing.py)
```
**How to reproduce it**:
Try launch airflow webserver with python **3.9**
**Anything else we need to know**:
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