ImportError: cannot import name 'parse_rule' from 'werkzeug.routing'-CodePudding

I got the following message after running my Flask project on another system. The application ran all the time without problems:

Error: While importing 'app', an ImportError was raised:

Traceback (most recent call last):
  File "c:\users\User\appdata\local\programs\python\python39\lib\site-packages\flask\cli.py", line 214, in locate_app
    __import__(module_name)
  File "C:\Users\User\Desktop\Projekt\app\__init__.py", line 3, in <module>
    from flask_restx import Namespace, Api
  File "c:\users\User\appdata\local\programs\python\python39\lib\site-packages\flask_restx\__init__.py", line 5, in <module>
  File "c:\users\User\appdata\local\programs\python\python39\lib\site-packages\flask_restx\api.py", line 50, in <module>
    from .swagger import Swagger
  File "c:\users\User\appdata\local\programs\python\python39\lib\site-packages\flask_restx\swagger.py", line 18, in <module>
    from werkzeug.routing import parse_rule
ImportError: cannot import name 'parse_rule' from 'werkzeug.routing' (c:\users\User\appdata\local\programs\python\python39\lib\site-packages\werkzeug\routing\__i
nit__.py)

My requirements.txt

Flask~=2.1.2
psycopg2-binary==2.9.3
Flask-SQLAlchemy==2.5.1
flask-restx==0.5.1
qrcode~=7.3.1
PyPDF2==2.6.0
reportlab~=3.6.10
WTForms~=3.0.1
flask-bootstrap==3.3.7.1
flask-wtf==1.0.1

CodePudding user response：

This is caused by parse_rule() being marked as :internal: on the latest release of werkzeug which impacts flask-restx (plus many others such as flask-login).

https://github.com/python-restx/flask-restx/issues/460 is open for flask-restx, https://github.com/maxcountryman/flask-login/issues/686 for flask-login.

As you've mentioned, pinning to an older version is the workaround for now (i.e. werkzeug==2.1.2).

CodePudding user response：

The solution (workaround) was that I additionally included werkzeug in the version 2.1.2 in the requirements.txt

werkzeug==2.1.2

more information at https://issuemode.com/issues/apache/airflow/111093941#answer-108883148

After that I could start the Flask application.