cannot import name 'cached_property' from 'werkzeug'

[bill-uncultured]

werkzeug just released 1.0.0, and the deprecated werkzeug.cached_property has been removed in favor of werkzeug.utils.cached_property.

This was addressed in October by pull request # 141, but it seems like it failed testing because the old python 3.3 and 2.6 couldn't be downloaded.

/usr/lib/python3.7/site-packages/flask_testing/__init__.py:13: in <module>
    from .utils import TestCase, LiveServerTestCase
/usr/lib/python3.7/site-packages/flask_testing/utils.py:35: in <module>
    from werkzeug import cached_property
E   ImportError: cannot import name 'cached_property' from 'werkzeug' (/usr/lib/python3.7/site-packages/werkzeug/__init__.py)

[teapow]

Same issue as: noirbizarre/flask-restplus#777

The proposed temporary solution is to pin Werkzeug==0.16.1 until a proper fix is put in place.

[erodrig]

I have created a fix for this #144

but CI infrastructure is not working

Downloading archive: https://storage.googleapis.com/travis-ci-language-archives/python/binaries/ubuntu/16.04/x86_64/python-2.6.tar.bz2
0.10s$ curl -sSf --retry 5 -o python-2.6.tar.bz2 ${archive_url}
curl: (22) The requested URL returned error: 404 Not Found

[Ri1a]

Another fix would be to edit the flask_testing/utils.py on line 35:
Use
from werkzeug.utils import cached_property
instead of
from werkzeug import cached_property

There's already a (closed) MR: #146

And an open one: #145

Edit: #145 has been merged

[elgohr]

Any updates regarding CI?

[Sispheor]

As it is fixed. Could you release a new version? :)

[Rahulrao0786]

from werkzeug import cached_property

ImportError: cannot import name 'cached_property' from 'werkzeug' (C:\Users\BABA\PycharmProjects\Automation\venv\lib\site-packages\werkzeug_init_.py)

I am getting this error message

[Rahulrao0786]

from flask import Flask
from flask_restplus import Api, Resource
from werkzeug.utils import *

app = Flask(name)
api = Api(app)

@api.route('/language')
class Language:
def get(self):
return {'hey': 'there'}

if name == "main":
app.run(debug=True)

[vicmunoz]

I've fixed this with:
import werkzeug
werkzeug.cached_property = werkzeug.utils.cached_property

[KareenaR]

I've fixed this with:
import werkzeug
werkzeug.cached_property = werkzeug.utils.cached_property

Thanks! This works.

[jnozsc]

fyi: this issue has been fixed in version 0.8.0

[evertoncastro]

Updating to Werkzeug==0.16.1 has fixed.

[felixminom]

Still happening when upgrading to 1.0.1 version

[philipperemy]

Still happening as of today.

[SidJain1412]

Still broken with werkzeug==1.0.1 as of 4th Sept 2020

Can be fixed by adding

import werkzeug
werkzeug.cached_property = werkzeug.utils.cached_property

before importing flask_restplus

[ctwardy]

Thanks @SidJain1412!

User-side workaround when not expecting to call werkzeug directly:

try:
    from flask_restplus import Resource, Api
except ImportError:
    import werkzeug
    werkzeug.cached_property = werkzeug.utils.cached_property
    from flask_restplus import Resource, Api

[JosephHubbard]

This is still an issue.
My API backend still fails when using untampered Flask due to "cannot import name 'cached_property' from 'werkzeug'".

[bharath-kumarn]

This is still an issue.

ontology_1 | File "./get_title_details.py", line 1, in
ontology_1 | from robobrowser import RoboBrowser
ontology_1 | File "/usr/local/lib/python3.6/site-packages/robobrowser/init.py", line 3, in
ontology_1 | from .browser import RoboBrowser
ontology_1 | File "/usr/local/lib/python3.6/site-packages/robobrowser/browser.py", line 8, in
ontology_1 | from werkzeug import cached_property
ontology_1 | ImportError: cannot import name 'cached_property'

[paulakeen]

If I downgrade to Werkzeug==0.16.1 I get this other error:
from werkzeug.local import ContextVar
ImportError: cannot import name 'ContextVar' from 'werkzeug.local' (/home/paula/venvs/bidlab-venv/lib/python3.8/site-packages/werkzeug/local.py)

[ritesh-hubbler]

Werkzeug==2.0.1
Flask==2.0.1
flask-restplus==0.13.0

With this requirements, the issue is still there, I downgraded to
Werkzeug == 1.16.1 and downgraded other dependencies too... so it worked, but it should be working with latest version too, so please release a new version with this fix.

[rafael-andrade]

Werkzeug==2.0.1
Flask==2.0.1
flask-restplus==0.13.0

With this requirements, the issue is still there, I downgraded to
Werkzeug == 1.16.1 and downgraded other dependencies too... so it worked, but it should be working with latest version too, so please release a new version with this fix.

When I downgrade it says: flask 2.0.1 requires Werkzeug>=2.0, but you'll have werkzeug 0.16.1 which is incompatible.. Any suggestions?

[ipam73]

+1 Any ideas on how to resolve this? Haven't been able to solve the issue with the responses above and downgrading is not an option due to flask 2.0.1 not being compatible.

Flask==2.0.1
Flask-RESTful==0.3.9
Flask-Testing==0.7.1
Werkzeug==2.0.1

Traceback:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/unittest/loader.py", line 434, in _find_test_path
    module = self._get_module_from_name(name)
  File "/usr/local/lib/python3.7/unittest/loader.py", line 375, in _get_module_from_name
    __import__(name)
  File "/usr/src/app/project/tests/test_account_model.py", line 6, in <module>
    from project.tests.base import BaseTestCase
  File "/usr/src/app/project/tests/base.py", line 4, in <module>
    from flask_testing import TestCase
  File "/usr/local/lib/python3.7/site-packages/flask_testing/__init__.py", line 13, in <module>
    from .utils import TestCase, LiveServerTestCase
  File "/usr/local/lib/python3.7/site-packages/flask_testing/utils.py", line 35, in <module>
    from werkzeug import cached_property
ImportError: cannot import name 'cached_property' from 'werkzeug' (/usr/local/lib/python3.7/site-packages/werkzeug/__init__.py)

[toddman2]

If I downgrade to Werkzeug==0.16.1 I get this other error:
from werkzeug.local import ContextVar
ImportError: cannot import name 'ContextVar' from 'werkzeug.local' (/home/paula/venvs/bidlab-venv/lib/python3.8/site-packages/werkzeug/local.py)

100%. I can't believe this is still going on.

[bharath-kumarn]

Yes

…

On Tue, 13 Jul, 2021, 9:19 am toddman2, ***@***.***> wrote: If I downgrade to Werkzeug==0.16.1 I get this other error: from werkzeug.local import ContextVar ImportError: cannot import name 'ContextVar' from 'werkzeug.local' (/home/paula/venvs/bidlab-venv/lib/python3.8/site-packages/werkzeug/local.py) 100%. I can't believe this is still going on. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#143 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALR2PCSCNX3Y2TKMUKDSPDDTXOZWHANCNFSM4KRE6NPQ> .

[palmettobugz]

Maybe related: Switch locals to be based on ContextVars #1778
https://github.com/pallets/werkzeug/pull/1778

pgjones commented on Mar 28, 2020 •
ContextVar was introduced in Python 3.7 and is effectively the same as Local in Werkzeug (although a different API). They should work in Greenlet and threading contexts as before but also now in asyncio or other async/await contexts.

The storage attribute has been kept for backwards compatibility (even though it is a dunder it seems it is used, e.g. in tests).

The ident_func though must be deprecated as this is now handled by the ContextVar. This may cause some backwards incompatibility.

[4vadim4]

Is there a solution to this problem?
Because the first mention with Flask==2.0.1, flask-restplus==0.13.0, Werkzeug==2.0.1 was in June.
This bug has yet to be resolved?

[Ninthpool]

The issue still persists as of today... temporary workaround:

try: 
    from flask_restplus import Api, Resource
except ImportError:
    import werkzeug, flask.scaffold
    werkzeug.cached_property = werkzeug.utils.cached_property
    flask.helpers._endpoint_from_view_func = flask.scaffold._endpoint_from_view_func
    from flask_restplus import Api, Resource

[vikramadhav]

Current requirements.txt

Flask==2.1.2
Flask-Assets==2.0
flask-restplus==0.13.0
Werkzeug==2.1.2

and applied work around as (Downgrade is not possible due to compatibility)

try: 
    from flask_restplus import Api, Resource,Namespace
except ImportError:
    import werkzeug, flask.scaffold
    werkzeug.cached_property = werkzeug.utils.cached_property
    flask.helpers._endpoint_from_view_func = flask.scaffold._endpoint_from_view_func
    from flask_restplus import Api, Resource,Namespace
    
from models.hello_world import helloWork

data_edits_namespce=Namespace('data_edits')

data_edits_namespce.add_model('HelloWorld',helloWork)

Now the exception is coming

from flask_restplus import Api, Resource,Namespace
venv/lib/python3.10/site-packages/flask_restplus/model.py", line 8, in <module> from collections import OrderedDict, MutableMapping
ImportError: cannot import name 'MutableMapping' from 'collections' (/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/collections/__init__.py)

Not sure what i am missing here , does any one else also faced same issue

[felixminom]

We all should be migrating to flask-restx which is a wrapper for this library and it's been actively maintained.

[toddman2]

Clearly seems the owner is busy these days or no longer has an interest in fixing this. I'm cutting the guy some slack -- it's been a useful package so far. It would be appreciated if he could check in with us one way or another. Thanks for all your time you've put into so far.

[fauber5]

"
#0 370.1 ERROR: Cannot install -r requirements.txt (line 32) and Werkzeug==0.16.1 because these package versions have conflicting dependencies.
#0 370.1
#0 370.1 The conflict is caused by:
#0 370.1 The user requested Werkzeug==0.16.1
#0 370.1 flask 2.0.2 depends on Werkzeug>=2.0

The temporary solution isn't possible. "pin Werkzeug==0.16.1 until a proper fix is put in place."