Apache Airflow : airflow initdb throws ModuleNotFoundError: No module named 'wtforms.compat'

Question

On Ubuntu 21.04 with python 3.9, trying to install airflow. When I ran airflow init db command, below error is thrown

File "", line 855, in exec_module File "", line 228, in call_with_frames_removed File "/home/user/USB/.venv/lib/python3.9/site-packages/airflow/migrations/versions/82b7c48c147f_remove_can_read_permission_on_config.py", line 29, in from airflow.www.app import create_app File "/home/user/USB/.venv/lib/python3.9/site-packages/airflow/www/app.py", line 24, in from flask_appbuilder import SQLA File "/home/user/USB/.venv/lib/python3.9/site-packages/flask_appbuilder/init.py", line 6, in from .base import AppBuilder # noqa: F401 File "/home/user/USB//.venv/lib/python3.9/site-packages/flask_appbuilder/base.py", line 8, in from .api.manager import OpenApiManager File "/home/user/USB//.venv/lib/python3.9/site-packages/flask_appbuilder/api/manager.py", line 8, in from flask_appbuilder.baseviews import BaseView File "/home/user/USB//.venv/lib/python3.9/site-packages/flask_appbuilder/baseviews.py", line 21, in from .forms import GeneralModelConverter File "/home/user/USB//.venv/lib/python3.9/site-packages/flask_appbuilder/forms.py", line 16, in from .fields import EnumField, QuerySelectField, QuerySelectMultipleField File "/home/user/USB//.venv/lib/python3.9/site-packages/flask_appbuilder/fields.py", line 6, in from wtforms.compat import string_types, text_type

I tried installing wtforms separately.

airflow was installing with pipenv

Any idea?

thanks

Answer 1

Just install airflow including constraints files as explained in installation documentation.

Airflow has complex dependencies and specific way of installation and in order to install it.in consistent way, you need to use constraints.

https://airflow.apache.org/docs/apache-airflow/stable/installation.html#installation-script