fails to start on python 3.10.1

[muralikodali]

excalibur fails to load with python version 3.10.1 giving the below error :

Traceback (most recent call last):
  File "/home/murali/.local/bin/excalibur", line 5, in <module>
    from excalibur.cli import cli
  File "/home/murali/.local/lib/python3.10/site-packages/excalibur/cli.py", line 7, in <module>
    from . import __version__, settings
  File "/home/murali/.local/lib/python3.10/site-packages/excalibur/settings.py", line 10, in <module>
    from . import configuration as conf
  File "/home/murali/.local/lib/python3.10/site-packages/excalibur/configuration.py", line 7, in <module>
    from backports.configparser import ConfigParser
  File "/home/murali/.local/lib/python3.10/site-packages/backports/configparser/__init__.py", line 130, in <module>
    from collections import MutableMapping
ImportError: cannot import name 'MutableMapping' from 'collections' (/usr/lib/python3.10/collections/__init__.py)

[Philippe-M]

Hello, i've the same problem

[Andrflor]

You have an outdated version of configparser using a deprecated call that has been removed in python 3.10.
Using pip for example you can update with:

pip install configparser -U

As a rule of thumb, try to keep you packages updated to prevent this kind of issues.

[muralikodali]

pip install configparser -u giving the following output :

Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: configparser in /home/murali/.local/lib/python3.10/site-packages (5.2.0)

Above error ImportError: cannot import name 'MutableMapping' from 'collections' (/usr/lib/python3.10/collections/__init__.py) is shown again.

[Andrflor]

You have two install of configparser.

Look the path

Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: configparser in /home/murali/.local/lib/python3.10/site-packages (5.2.0)

Above error ImportError: cannot import name 'MutableMapping' from 'collections' (/usr/lib/python3.10/collections/__init__.py) is shown again.

One is : /usr/lib/python3.10/
And the other is : /home/murali/.local/lib/python3.10/

You can check the versions of the packages installed with:
pip freeze for root packages
and pip freeze --user for your user.

I guess that pip freeze --user will give you the latest 5.2.0
And the pip freeze has an outdated version.

(If you are not familiar with bash you can use grep to locate a package for example you can do)
pip freeze | grep configparser

I think you may need to update the root package and not the local one to make it work.
sudo pip install configparser -U

If it does not work, i'm curious to see full outputs of both of your pip freeze...

[muralikodali]

i have installed configparser-5.2.0 with pip install --upgrade configparser, but excalibur is showing lower version requirement for configparser.

Successfully uninstalled configparser-3.5.3
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
excalibur-py 0.4.3 requires configparser<3.6.0,>=3.5.0, but you have configparser 5.2.0 which is incompatible.
Successfully installed configparser-5.2.0

[Andrflor]

My current config on python 3.10 root packages

excalibur-py==0.4.3
  - camelot-py [required: >=0.7.1, installed: 0.9.0]
...
  - configparser [required: >=3.5.0,<3.6.0, installed: 5.2.0]
...

As you can see i have configparser 5.2.0 even if the requirement says >=3.5.0,<3.6.0 and it's working like a charm...
Is it working for you?

Still, a configparser requirement version update is needed...

[MKuranowski]

Updating cofigparser unravels another dependency issue with itsdangerous; which in turn needs to be downgraded to 2.0.1.

Traceback (most recent call last):
  File "/home/mikolaj/Desktop/tables/excalibur/bin/excalibur", line 5, in <module>
    from excalibur.cli import cli
  File "/home/mikolaj/Desktop/tables/excalibur/lib/python3.10/site-packages/excalibur/cli.py", line 12, in <module>
    from .www.app import create_app
  File "/home/mikolaj/Desktop/tables/excalibur/lib/python3.10/site-packages/excalibur/www/app.py", line 3, in <module>
    from flask import Flask, Blueprint
  File "/home/mikolaj/Desktop/tables/excalibur/lib/python3.10/site-packages/flask/__init__.py", line 19, in <module>
    from . import json
  File "/home/mikolaj/Desktop/tables/excalibur/lib/python3.10/site-packages/flask/json/__init__.py", line 15, in <module>
    from itsdangerous import json as _json
ImportError: cannot import name 'json' from 'itsdangerous' (/home/mikolaj/Desktop/tables/excalibur/lib/python3.10/site-packages/itsdangerous/__init__.py)

[kuirolo]

Apologies if this is a lot of terminal dumps and not a lot of pull requests. I'm fairly new to contributing.

This seems partly related to issue #152 which I had on python 3.8 with similar ImportErrors.

On python 3.10, starting from a fresh venv I had the following chain of ImportErrors while trying to run excalibur initdb, the first few were resolved by updated the importing package as @Andrflor suggested.

TL;DR: this issue might be resolved by moving up some of the version requirements in setup.py, and changing an import call in excalibur.www.views

Here's what happend for me:

(venv) $ pip install excalibur
(venv) $ excalibur initdb
...
  File "/home/kuirolo/.venv/excal310/lib64/python3.10/site-packages/excalibur/configuration.py", line 7, in <module>
    from backports.configparser import ConfigParser
  File "/home/kuirolo/.venv/excal310/lib64/python3.10/site-packages/backports/configparser/__init__.py", line 130, in <module>
    from collections import MutableMapping
ImportError: cannot import name 'MutableMapping' from 'collections' (/usr/lib64/python3.10/collections/__init__.py)
(venv) $ pip install -U configparser # Move from 3.5.2 to 5.2.0

With option captial -U this resolved @muralikodali 's issue for me.

(venv) $ excalibur initdb
...
  File "/home/kuirolo/.venv/excal310/lib64/python3.10/site-packages/excalibur/www/app.py", line 3, in <module>
    from flask import Flask, Blueprint
  File "/home/kuirolo/.venv/excal310/lib64/python3.10/site-packages/flask/__init__.py", line 14, in <module>
   from jinja2 import escape
ImportError: cannot import name 'escape' from 'jinja2' (/home/kuirolo/.venv/excal310/lib64/python3.10/site-packages/jinja2/__init__.py)
(venv) $ pip install -U flask # Move from flask 1.1.2 to 2.1.1 and from werkzeug 0.16.1 to 2.1.1

This is an upstream issue with flask 1.1.0, so it is resolved by upgrading. I also had this issue on python 3.8 after resolving issue #152 .

(venv) $ excalibur initdb
...
  File "/home/kuirolo/.venv/excal310/lib64/python3.10/site-packages/excalibur/www/app.py", line 7, in <module>
    from .views import views
  File "/home/kuirolo/.venv/excal310/lib64/python3.10/site-packages/excalibur/www/views.py", line 10, in <module>
    from werkzeug import secure_filename
ImportError: cannot import name 'secure_filename' from 'werkzeug' (/home/kuirolo/.venv/excal310/lib64/python3.10/site-packages/werkzeug/__init__.py)

Here I think the solution is changing the excalibur.www.views import call to reflect the refactoring of workzeug in 2.1.1. According to this stackoverflow secure_filename now has to be imported using from workzeug.utils import secure_filename.

I'll take a crack at fixing this tomorrow if I have time.

[Edited for clarity and terminal formatting]

[echidne]

@kuirolo I'm stuck at the same step than you => did you find a work around?

[sh4yce]

Did this ever get fixed?
Having the same issue

EDIT: @kuirolo was correct in his next steps. I fixed it by changing view.py on the line importing secure_filename from workzeug (which should be from workzeug.utils)

[dmil]

+1 having the same issue

[oleole39]

Same issue here as the one pictured and solved by kuirolo hereinabove although there seems to be a typo in what @kuirolo & @sh4yce mention at the final step of the fix (it is werkzeug and not workzeug).

To sum up, I was able to run excalibur initdb and excalibur webserver successfully after doing the following:

1. pip install -U configparser
2. pip install -U flask
3. Replace line 10 of {ROOT_TO_PYTHON_FOLDER}/python3.10/site-packages/excalibur/www/views.py with from werkzeug.utils import secure_filename (i.e. overwriting previous line containing from werkzeug import secure_filename)

[kilojulius]

@oleole39 Thanks! That worked well for me!