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

[SentinelWarren]

Issue description

Running pipenv install --verbose failed.

Expected result

Expected a virtual env to be set up, a pipfile created, and no errors to pop up.

Actual result

Traceback (most recent call last):
  File "c:\python38\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\python38\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Python38\Scripts\pipenv.exe\__main__.py", line 7, in <module>
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 782, in main
    rv = self.invoke(ctx)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\decorators.py", line 73, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\decorators.py", line 21, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "c:\python38\lib\site-packages\pipenv\cli\command.py", line 231, in install
    retcode = do_install(
  File "c:\python38\lib\site-packages\pipenv\core.py", line 1924, in do_install
    ensure_project(
  File "c:\python38\lib\site-packages\pipenv\core.py", line 581, in ensure_project
    ensure_virtualenv(
  File "c:\python38\lib\site-packages\pipenv\core.py", line 495, in ensure_virtualenv
    python = ensure_python(three=three, python=python)
  File "c:\python38\lib\site-packages\pipenv\core.py", line 385, in ensure_python
    path_to_python = find_a_system_python(python)
  File "c:\python38\lib\site-packages\pipenv\core.py", line 347, in find_a_system_python
    return next(iter(finder.find_all_python_versions()), None)
  File "c:\python38\lib\site-packages\pipenv\vendor\pythonfinder\pythonfinder.py", line 328, in find_all_python_versions
    path_list = sorted(versions, key=version_sort, reverse=True)
AttributeError: 'NoneType' object has no attribute 'version_sort'

Steps to replicate

Provide the steps to replicate (which usually at least includes the commands and the Pipfile).

pipenv install --verbose on win10 machine.

$ pipenv --support

Pipenv version: '2020.5.28'

Pipenv location: 'c:\\python38\\lib\\site-packages\\pipenv'

Python location: 'c:\\python38\\python.exe'

Python installations found:

Traceback (most recent call last):
  File "c:\python38\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\python38\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Python38\Scripts\pipenv.exe\__main__.py", line 7, in <module>
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 782, in main
    rv = self.invoke(ctx)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 1236, in invoke
    return Command.invoke(self, ctx)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\decorators.py", line 73, in new_func    
    return ctx.invoke(f, obj, *args, **kwargs)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "C:\Python38\Lib\site-packages\pipenv\vendor\click\decorators.py", line 21, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "c:\python38\lib\site-packages\pipenv\cli\command.py", line 138, in cli
    get_pipenv_diagnostics()
  File "c:\python38\lib\site-packages\pipenv\help.py", line 33, in get_pipenv_diagnostics
    python_paths = finder.find_all_python_versions()
  File "c:\python38\lib\site-packages\pipenv\vendor\pythonfinder\pythonfinder.py", line 328, in find_all_python_versions
    path_list = sorted(versions, key=version_sort, reverse=True)
AttributeError: 'NoneType' object has no attribute 'version_sort'

[jasoncammarata]

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

[jasoncammarata]

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.

[roshansivakumar]

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?

[vincentclaes]

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

[madnoh]

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\Python38\python.exe"

Viola! Virtual environment created.

[leehanchung]

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"

[Insigna2020]

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

[requires]
python_version = "3.8"