Ignore pythonz / gracefully handle non-pythons

[techalchemy]

No description provided.

[AlJohri]

Even on a regular pyenv python, Python 3.6.5, I'm getting the pythonz not found error via a WindowsError:

Error %s while executing command %s name 'WindowsError' is not defined /usr/local/bin/pythonz -c import sys; print(sys.version.split()[0])
Traceback (most recent call last):
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 102, in _spawn_subprocess
    return subprocess.Popen(cmd, **options)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/subprocess.py", line 709, in __init__
    restore_signals, start_new_session)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/subprocess.py", line 1344, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/bin/pythonz': '/usr/local/bin/pythonz'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/johria/.pyenv/versions/3.6.5/bin/pipenv", line 11, in <module>
    sys.exit(cli())
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/cli/command.py", line 249, in install
    editable_packages=state.installstate.editables,
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/core.py", line 1724, in do_install
    pypi_mirror=pypi_mirror,
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/core.py", line 565, in ensure_project
    pypi_mirror=pypi_mirror,
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/core.py", line 488, in ensure_virtualenv
    python = ensure_python(three=three, python=python)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/core.py", line 401, in ensure_python
    path_to_python = find_a_system_python(python)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/core.py", line 364, in find_a_system_python
    python_entry = finder.find_python_version(line)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/pythonfinder.py", line 91, in find_python_version
    major=major, minor=minor, patch=patch, pre=pre, dev=dev, arch=arch
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 262, in find_python_version
    (c for c in sorted(path_filter, key=version_sort, reverse=True)), None
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 259, in <genexpr>
    path_filter = filter(None, (sub_finder(p) for p in paths if p is not None))
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/mixins.py", line 106, in find_python_version
    py_filter, key=lambda child: child[1].version_sort, reverse=True
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/mixins.py", line 96, in <genexpr>
    if child.as_python
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/cached_property.py", line 35, in __get__
    value = obj.__dict__[self.func.__name__] = self.func(obj)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 364, in as_python
    self.py_version = PythonVersion.from_path(self.path)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/python.py", line 162, in from_path
    py_version = get_python_version(str(path.path))
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/utils.py", line 37, in get_python_version
    out, _ = vistir.misc.run(version_cmd, block=True, nospin=True)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 293, in run
    combine_stderr=combine_stderr
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 124, in _create_subprocess
    combine_stderr=combine_stderr)
  File "/Users/johria/.pyenv/versions/3.6.5/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 103, in _spawn_subprocess
    except WindowsError as e:
NameError: name 'WindowsError' is not defined