__init__.py tries to import class SharedDataMiddleware from a wrong module

[babakRz63ai]

I installed isso on a CentOS 8 machine using PyPi for Python 3.6, and following instructions on the website, in a virtual environment in /opt/isso. Now when I want to start isso, it displays this stack trace and exits:

Traceback (most recent call last):
  File "./isso", line 5, in <module>
    from isso import main
  File "/opt/isso/lib/python3.6/site-packages/isso/__init__.py", line 60, in <module>
    from werkzeug.wsgi import SharedDataMiddleware
ImportError: cannot import name 'SharedDataMiddleware'

I've noticed there is no SharedDataMiddleware class in /opt/isso/lib/python3.6/site-packages/werkzeug/wsgi.py but this class indeed sits in /opt/isso/lib/python3.6/site-packages/werkzeug/middleware/shared_data.py.

These are versions of python and pip in the virtual environment:

Python 3.6.8
pip 20.0.2 from /opt/isso/lib/python3.6/site-packages/pip (python 3.6)

And this is version of werkzeug found in its __init__.py : __version__ = "1.0.1"

[jelmer]

Thanks for the report - this is a dupe of #617.