2018.11.26: pipenv emits pythons errors when creating a virtualenv

Issue description

Possibly related to #3229, pipenv continues to throw errors when creating a virtualenv:

$ pipenv --three
['Traceback (most recent call last):\n', '  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 160, in _create_subprocess\n    combine_stderr=combine_stderr)\n', '  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 134, in _spawn_subprocess\n    return subprocess.Popen(cmd, **options)\n', '  File "/usr/local/Cellar/python/3.6.5_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 709, in __init__\n    restore_signals, start_new_session)\n', '  File "/usr/local/Cellar/python/3.6.5_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 1344, in _execute_child\n    raise child_exception_type(errno_num, err_msg, err_filename)\n', "FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/bin/pythonz': '/usr/local/bin/pythonz'\n", '\nDuring handling of the above exception, another exception occurred:\n\n', 'Traceback (most recent call last):\n', '  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/vistir/contextmanagers.py", line 150, in spinner\n    yield _spinner\n', '  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 314, in run\n    write_to_stdout=True\n', '  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 162, in _create_subprocess\n    sys.stderr.write("Error %s while executing command %s", exc, " ".join(cmd._parts))\n', 'TypeError: write() takes exactly one argument (3 given)\n']
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 160, in _create_subprocess
    combine_stderr=combine_stderr)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 134, in _spawn_subprocess
    return subprocess.Popen(cmd, **options)
  File "/usr/local/Cellar/python/3.6.5_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 709, in __init__
    restore_signals, start_new_session)
  File "/usr/local/Cellar/python/3.6.5_1/Frameworks/Python.framework/Versions/3.6/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 "/usr/local/bin/pipenv", line 11, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 1114, in invoke
    return Command.invoke(self, ctx)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/pipenv/cli/command.py", line 208, in cli
    clear=state.clear,
  File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 574, in ensure_project
    pypi_mirror=pypi_mirror,
  File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 516, in ensure_virtualenv
    ensure_python(three=three, python=python)
  File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 397, in ensure_python
    path_to_python = find_a_system_python(python)
  File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 360, in find_a_system_python
    python_entry = finder.find_python_version(line)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/pythonfinder.py", line 114, in find_python_version
    major=major, minor=minor, patch=patch, pre=pre, dev=dev, arch=arch, name=name
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 396, in find_python_version
    ver = next(iter(self.get_pythons(sub_finder)), None)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 279, in get_pythons
    reverse=True
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 277, in <genexpr>
    (p for p in self._filter_paths(finder) if p.is_python),
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 264, in <genexpr>
    pth for pth in unnest(finder(p) for p in self.path_entries if p is not None)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/utils.py", line 251, in unnest
    for el in target:
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 264, in <genexpr>
    pth for pth in unnest(finder(p) for p in self.path_entries if p is not None)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/mixins.py", line 121, in find_python_version
    for child in unnest(self.pythons.values())
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 531, in pythons
    for path, entry in self.children.items():
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/cached_property.py", line 35, in __get__
    value = obj.__dict__[self.func.__name__] = self.func(obj)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 501, in children
    for child_key, child_val in self._gen_children():
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 493, in _gen_children
    entry = PathEntry.create(path=child, **pass_args)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 575, in create
    _new = cls(**creation_args)
  File "<attrs generated init b90d7581ea07925e94241736776cf96c889eb52c>", line 16, in __init__
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/path.py", line 518, in get_py_version
    py_version = PythonVersion.from_path(path=self, name=self.name)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/models/python.py", line 395, in from_path
    py_version = get_python_version(path.path.absolute().as_posix())
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/pythonfinder/utils.py", line 68, in get_python_version
    combine_stderr=False, write_to_stdout=False)
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 314, in run
    write_to_stdout=True
  File "/usr/local/lib/python3.6/site-packages/pipenv/vendor/vistir/misc.py", line 162, in _create_subprocess
    sys.stderr.write("Error %s while executing command %s", exc, " ".join(cmd._parts))
TypeError: write() takes exactly one argument (3 given)

Expected result

Expected no error logging while simply creating a virtualenv.

Actual result

virtualenv creation fails.

Steps to replicate

$ pipenv --three

---

pipenv --support also emits these errors and fails to collect support information!

[command-tab]

The current release sure seems hosed to me. Another temporary workaround I saw in a past issue was to specifically pass in a python path like so:

pipenv --three --python=`which python3`

I’ve been doing this with success for the time being 😬

[pavithrarajs]

Ah ok. And yeah the bug makes sense. I’ll just tag it upstream and make sure it gets fixed

Still issue persists, any idea when this fix will be released.