Pipenv: AttributeError: 'NoneType' object has no attribute 'version_sort'

I'm getting the same error. Looking forward to someone smarter finding a resolution

I found a workaround, but I'm not good enough with computers/python/virtual environments to know why it works.
From Terminal:

1. Download virtualenv (if your pip install of pipenv didn't already)
2. Create a virtual environment in virtualenv --> look online for instructions
3. once inside the virtualenv go to the folder you want your pipfile
4. pipenv install [python_package]
5. Should create the pipfile and lock files. Then exit the virtual environment
6. Navigate to the folder for your project with pipenv files
7. type pipenv shell. This should create a virtual environment within the pipenv construct.

i've got the same error, anything to resolve it?
Though pipenv install in a created virtaulenv works with no issues like jasoncammarata mentioned.
Why is that?

this issue still persists on win10 with python 3.8.3 and pipenv 2020.6.2

DVCL643@10NB03610:~/workspace/python/mailswitch_security$ pipenv shell
Traceback (most recent call last):
  File "c:\users\dvcl643\appdata\local\programs\python\python38\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\dvcl643\appdata\local\programs\python\python38\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\dvcl643\AppData\Local\Programs\Python\Python38\Scripts\pipenv.exe\__main__.py", line 9, in <module>
  File "C:\Users\dvcl643\AppData\Local\Programs\Python\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "C:\Users\dvcl643\AppData\Local\Programs\Python\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 782, in main
    rv = self.invoke(ctx)
  File "C:\Users\dvcl643\AppData\Local\Programs\Python\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "C:\Users\dvcl643\AppData\Local\Programs\Python\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "C:\Users\dvcl643\AppData\Local\Programs\Python\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "C:\Users\dvcl643\AppData\Local\Programs\Python\Python38\Lib\site-packages\pipenv\vendor\click\decorators.py", line 73, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "C:\Users\dvcl643\AppData\Local\Programs\Python\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "c:\users\dvcl643\appdata\local\programs\python\python38\lib\site-packages\pipenv\cli\command.py", line 428, in shell
    do_shell(
  File "c:\users\dvcl643\appdata\local\programs\python\python38\lib\site-packages\pipenv\core.py", line 2363, in do_shell
    ensure_project(
  File "c:\users\dvcl643\appdata\local\programs\python\python38\lib\site-packages\pipenv\core.py", line 576, in ensure_project
    ensure_virtualenv(
  File "c:\users\dvcl643\appdata\local\programs\python\python38\lib\site-packages\pipenv\core.py", line 498, in ensure_virtualenv
    python = ensure_python(three=three, python=python)
  File "c:\users\dvcl643\appdata\local\programs\python\python38\lib\site-packages\pipenv\core.py", line 388, in ensure_python
    path_to_python = find_a_system_python(python)
  File "c:\users\dvcl643\appdata\local\programs\python\python38\lib\site-packages\pipenv\core.py", line 350, in find_a_system_python
    return next(iter(finder.find_all_python_versions()), None)
  File "c:\users\dvcl643\appdata\local\programs\python\python38\lib\site-packages\pipenv\vendor\pythonfinder\pythonfinder.py", line 328, in find_all_python_ve
rsions
    path_list = sorted(versions, key=version_sort, reverse=True)
AttributeError: 'NoneType' object has no attribute 'version_sort'

I have solved this by reverting to

pip install pipenv==2018.11.26

Windows 10, Python 3.8.3, pipenv 2020.6.2

I managed to solve this by typing in the full path to the python.exe:

pipenv install --python="C:\Users\my_name\AppData\Local\Programs\Python\Python38python.exe"

Viola! Virtual environment created.

Still getting the same error with full path to python.exe.

Windows 10, Build 20161
Miniconda Python 3.7.4
pipenv 2020.6.2

pipenv install --python="C:\Users\Han\Miniconda3\python.exe"

Pipfile:

[[source]]
name = "pypi"
url = "https://pypi.org/simple"
verify_ssl = true

[dev-packages]
pytest = "*"
v = {editable = true,version = "*"}

[packages]
numpy = "==1.19"
tensorflow = "==2.2"
pillow = "*"
requests = "*"
nltk = "*"
matplotlib = "*"

[requires]
python_version = "3.7"

I ended up having to specify Python version on pipfile in order to work with 3.8

[requires]
python_version = "3.8"

where is pipfile located ?

where is pipfile located ?

@vincentclaes thanks issues has been solved..

I am also seeing this error on OSX 10.14.6, with pipenv 2020.8.13:

Pipfile:

[requires]
python_version = "3.7.6"

pipenv install --dev --python $(pyenv root)/versions/3.7.6/bin/python

Finally,
AttributeError: 'NoneType' object has no attribute 'url'

Did you ever find a solution to this @mracette ?

Edit: I had mracette's exact same error message, but was able to resolve it by reverting to pipenv==2018.11.26. It appeared in version pipenv==2020.4.1b1 which is the first release after the 2018 one.

@sigtot I also had to revert to 2018.11.26

@sigtot pip-tools and run of-the-mill venv? :smile:

I am getting this too. Is there any specific reason as to why this is happening? Does it use the PATH / PYTHONPATH env variable?

I had multiple versions of python installed, along with trying out chocolatey and this error just appeared one day. Probably after I upgraded it. I went through, uninstalled every listed version of python, reinstalled 3.8.6 at system-level and still got this error. Uninstalled that and used chocolatey to install 3.8.6 and, yet again, still popped up.

I'm not sure if somehow my environment variables got messed up with the multiple versions and chocolatey, but I thought it would have been fixed with an uninstall/reinstall.

I also got that error!!! Centos enviroment makes no sense as well.. have tried 2 computers under pipenv&pyenv,same message

as others have stated, resolved downgrading to pipenv 2018.11.26_4

• create file pipenv.rb with content of https://raw.githubusercontent.com/Homebrew/homebrew-core/fd7578b01f869570c0748a4e0ba54e064870e91d/Formula/pipenv.rb
• run
  brew uninstall pipenv
brew install ./pipenv.rb