pipenv failed in virtualenv

[craynic]

pipenv, version 2018.10.9

(create a new virtualenv and install pipenv)
$ pipenv install ipython
Installing ipython…
(....something does not matter)
Adding ipython to Pipfile's [packages]…
Pipfile.lock (17b797) out of date, updating to (8fdd10)…
Locking [dev-packages] dependencies…
Traceback (most recent call last):
File "/home/craynic/.virtualenvs/test2/bin/pipenv", line 11, in
sys.exit(cli())
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 764, in call
return self.main(*args, **kwargs)
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
return ctx.invoke(f, obj, *args, **kwargs)
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/cli/command.py", line 249, in install
editable_packages=state.installstate.editables,
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/core.py", line 1950, in do_install
skip_lock=skip_lock,
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/core.py", line 1242, in do_init
pypi_mirror=pypi_mirror,
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/core.py", line 1034, in do_lock
pypi_mirror=pypi_mirror,
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/utils.py", line 355, in venv_resolve_deps
escape_grouped_arguments(which("python", allow_global=allow_global)),
File "/home/craynic/.virtualenvs/test2/lib/python3.7/site-packages/pipenv/core.py", line 109, in which
if not location and os.path.exists(location):
File "/home/craynic/.virtualenvs/test2/lib/python3.7/genericpath.py", line 19, in exists
os.stat(path)
TypeError: stat: path should be string, bytes, os.PathLike or integer, not NoneType

[techalchemy]

Thanks for the report, the logic there is pretty straightforwardly flawed:

if not location and os.path.exists(location): can never actually evaluate without failing

sorry for that!