"pipenv --python X.Y" fails with a traceback if pyenv has debug versions installed

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Issue description

pipenv --python X.Y command checks pyenv’s version list and does not like the debug builds (whose versions look like X.Y.Z-debug) failing with a traceback.

Expected result

I would expect pipenv to ignore unsupported versions silently (and with one warning per incompatible version in verbose mode), and proceed with installing what it wants.

Actual result

pyenv versions

immerrr@mmrcomp:~/pipenv-temp$ pyenv versions
* system (set by /home/immerrr/src/pyenv/version)
  3.6.4
  3.6.6
  3.6.6-debug
  3.7.0

pipenv --python 3.6.4 (traceback)

immerrr@mmrcomp:~/pipenv-temp$ pipenv --verbose --python 3.6.4
Traceback (most recent call last):
  File "/home/immerrr/.local/bin/pipenv", line 11, in <module>
    sys.exit(cli())
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 1114, in invoke
    return Command.invoke(self, ctx)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/cli/command.py", line 203, in cli
    clear=state.clear,
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/core.py", line 561, in ensure_project
    pypi_mirror=pypi_mirror,
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/core.py", line 506, in ensure_virtualenv
    ensure_python(three=three, python=python)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/core.py", line 397, in ensure_python
    path_to_python = find_a_system_python(python)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/core.py", line 360, in find_a_system_python
    python_entry = finder.find_python_version(line)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/pythonfinder.py", line 86, in find_python_version
    return self.system_path.find_python_version(
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/pythonfinder.py", line 40, in system_path
    global_search=self.global_search,
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 305, in create
    global_search=global_search,
  File "<attrs generated init 86da6fe0111de9e514cb2e45cc4c2cdd5d1b77a5>", line 36, in __init__
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 101, in __attrs_post_init__
    self._setup_pyenv()
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 132, in _setup_pyenv
    self.pyenv_finder = PyenvFinder.create(root=PYENV_ROOT)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/pyenv.py", line 52, in create
    return cls(root=root)
  File "<attrs generated init b7362d3ad3f81af215543f778c6ac52da8efc1bf>", line 6, in __init__
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/pyenv.py", line 26, in get_versions
    version = PythonVersion.parse(p.name)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/python.py", line 110, in parse
    raise ValueError("Not a valid python version: %r" % version)
ValueError: Not a valid python version: <LegacyVersion('3.6.6-debug')>

Steps to replicate

$ mkdir pipenv-temp; cd pipenv-temp
$ pyenv install 3.6.4
$ pyenv install 3.6.6 --debug
$ pipenv --python 3.6.4

pipenv --support is not much of a help here, because it tries to report a list of existing python versions.

pipenv --support | xclip

immerrr@mmrcomp:~/pipenv-temp$ pipenv --support | xclip
Traceback (most recent call last):
  File "/home/immerrr/.local/bin/pipenv", line 11, in <module>
    sys.exit(cli())
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 1114, in invoke
    return Command.invoke(self, ctx)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/cli/command.py", line 142, in cli
    get_pipenv_diagnostics()
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/help.py", line 33, in get_pipenv_diagnostics
    python_paths = finder.find_all_python_versions()
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/pythonfinder.py", line 94, in find_all_python_versions
    python_version_dict = getattr(self.system_path, "python_version_dict")
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/pythonfinder.py", line 40, in system_path
    global_search=self.global_search,
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 305, in create
    global_search=global_search,
  File "<attrs generated init 86da6fe0111de9e514cb2e45cc4c2cdd5d1b77a5>", line 36, in __init__
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 101, in __attrs_post_init__
    self._setup_pyenv()
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 132, in _setup_pyenv
    self.pyenv_finder = PyenvFinder.create(root=PYENV_ROOT)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/pyenv.py", line 52, in create
    return cls(root=root)
  File "<attrs generated init 9b5f675c374466a4d4c73b5f8e0738e27fe467e3>", line 6, in __init__
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/pyenv.py", line 26, in get_versions
    version = PythonVersion.parse(p.name)
  File "/home/immerrr/.local/lib/python2.7/site-packages/pipenv/vendor/pythonfinder/models/python.py", line 110, in parse
    raise ValueError("Not a valid python version: %r" % version)
ValueError: Not a valid python version: <LegacyVersion('3.6.6-debug')>

[andreif]

Managed to get it working with the older versions:

pip install pip==18.0
pip install pipenv==2018.7.1

[techalchemy]

These issues are all resolved in the current master branch and the fix will be released shortly.