Pyenv and Python 3.4.* not installing

Issue description

Using pyenv 1.2.7 and pipenv 2018.10.13 I cannot install any variant of Python 3.4 without a stack trace. I have tested it with Python 3.5., 3.6., and 3.7.* and all of those versions work just fine.

Expected result

pipenv --python 3.4.9 correctly installs Python 3.4 with pyenv and the environment functions as expected.

Actual result

A stack trace is thrown from the pipenv code

Steps to replicate

Operating System: Fedora 27 on a desktop

1. Install pyenv and pipenv as usual, setting up all necessary env variables. (I know these work since pipenv handles all other supported versions of Python 3 just fine
2. run the command pipenv --install python 3.4
3. Will be prompted to have pyenv install Python 3.4.9. Accept.

Stack trace

[18:09:41] megger:~ $ pipenv --python 3.4
Warning: Python 3.4 was not found on your system…
Would you like us to install CPython 3.4.9 with pyenv? [Y/n]: y
Installing CPython 3.4.9 with pyenv (this may take a few minutes)…
Traceback (most recent call last):
  File "/home/megger/.local/bin/pipenv", line 11, in <module>
    sys.exit(cli())
  File "/home/megger/.local/pipx/venvs/pipenv/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/home/megger/.local/pipx/venvs/pipenv/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/home/megger/.local/pipx/venvs/pipenv/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 1114, in invoke
    return Command.invoke(self, ctx)
  File "/home/megger/.local/pipx/venvs/pipenv/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/megger/.local/pipx/venvs/pipenv/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/megger/.local/pipx/venvs/pipenv/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/home/megger/.local/pipx/venvs/pipenv/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/megger/.local/pipx/venvs/pipenv/lib/python3.6/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/home/megger/.local/pipx/venvs/pipenv/lib64/python3.6/site-packages/pipenv/cli/command.py", line 203, in cli
    clear=state.clear,
  File "/home/megger/.local/pipx/venvs/pipenv/lib64/python3.6/site-packages/pipenv/core.py", line 565, in ensure_project
    pypi_mirror=pypi_mirror,
  File "/home/megger/.local/pipx/venvs/pipenv/lib64/python3.6/site-packages/pipenv/core.py", line 488, in ensure_virtualenv
    python = ensure_python(three=three, python=python)
  File "/home/megger/.local/pipx/venvs/pipenv/lib64/python3.6/site-packages/pipenv/core.py", line 451, in ensure_python
    c = pyenv.install(version)
  File "/home/megger/.local/pipx/venvs/pipenv/lib64/python3.6/site-packages/pipenv/pyenv.py", line 117, in install
    timeout=PIPENV_INSTALL_TIMEOUT,
  File "/home/megger/.local/pipx/venvs/pipenv/lib64/python3.6/site-packages/pipenv/pyenv.py", line 73, in _pyenv
    raise PyenvError('faild to run {0}'.format(args), c)
  File "/home/megger/.local/pipx/venvs/pipenv/lib64/python3.6/site-packages/pipenv/pyenv.py", line 56, in __init__
    self.err = c.err
  File "/home/megger/.local/pipx/venvs/pipenv/lib64/python3.6/site-packages/pipenv/vendor/delegator.py", line 146, in err
    return self._pexpect_out
  File "/home/megger/.local/pipx/venvs/pipenv/lib64/python3.6/site-packages/pipenv/vendor/delegator.py", line 114, in _pexpect_out
    result += self.subprocess.after
TypeError: must be str, not type

---

$ pipenv --support

Pipenv version: '2018.10.13'

Pipenv location: '/home/megger/.local/pipx/venvs/pipenv/lib64/python3.6/site-packages/pipenv'

Python location: '/home/megger/.local/pipx/venvs/pipenv/bin/python3'

Python installations found:

• 3.7.1: /home/megger/.pyenv/versions/3.7.1/bin/python3.7
• 3.7.1: /home/megger/.pyenv/versions/3.7.1/bin/python3.7m
• 3.6.6: /home/megger/.pyenv/shims/python3
• 3.6.6: /usr/bin/python3.6m
• 3.6.6: /usr/bin/python3.6
• 3.5.6: /home/megger/.pyenv/versions/3.5.6/bin/python3.5
• 3.5.6: /home/megger/.pyenv/versions/3.5.6/bin/python3.5m
• 2.7.15: /home/megger/.pyenv/shims/python
• 2.7.15: /usr/bin/python2.7

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.6.6',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '4.18.16-100.fc27.x86_64',
 'platform_system': 'Linux',
 'platform_version': '#1 SMP Sun Oct 21 09:33:00 UTC 2018',
 'python_full_version': '3.6.6',
 'python_version': '3.6',
 'sys_platform': 'linux'}

System environment variables:

• XDG_MENU_PREFIX
• BYOBU_ULIMIT
• LANG
• GDM_LANG
• HISTCONTROL
• _VIRTUALENVWRAPPER_API
• DISPLAY
• HOSTNAME
• BYOBU_CONFIG_DIR
• OLDPWD
• BYOBU_DARK
• BYOBU_LIGHT
• COLORTERM
• USERNAME
• XDG_VTNR
• SSH_AUTH_SOCK
• BYOBU_PREFIX
• XDG_SESSION_ID
• BYOBU_TTY
• USER
• DESKTOP_SESSION
• BYOBU_TERM
• BYOBU_HIGHLIGHT
• WAYLAND_DISPLAY
• BYOBU_DISTRO
• PWD
• HOME
• BYOBU_PAGER
• JOURNAL_STREAM
• TMUX
• XDG_SESSION_TYPE
• XDG_DATA_DIRS
• BYOBU_DATE
• BYOBU_PYTHON
• BYOBU_CHARMAP
• XDG_SESSION_DESKTOP
• GJS_DEBUG_OUTPUT
• BYOBU_READLINK
• LOADEDMODULES
• MAIL
• BYOBU_WINDOW_NAME
• VIRTUALENVWRAPPER_SCRIPT
• VTE_VERSION
• TERM
• SHELL
• BYOBU_SED
• QT_IM_MODULE
• XMODIFIERS
• XDG_CURRENT_DESKTOP
• BYOBU_BACKEND
• TMUX_PANE
• XDG_SEAT
• SHLVL
• BYOBU_ACCENT
• BYOBU_TIME
• BYOBU_RUN_DIR
• MODULEPATH
• GDMSESSION
• GNOME_DESKTOP_SESSION_ID
• LOGNAME
• DBUS_SESSION_BUS_ADDRESS
• XDG_RUNTIME_DIR
• PATH
• MODULESHOME
• HISTSIZE
• GJS_DEBUG_TOPICS
• SESSION_MANAGER
• LESSOPEN
• LS_COLORS
• ZSH
• WORKON_HOME
• PAGER
• LESS
• LC_CTYPE
• LSCOLORS
• PYENV_SHELL
• PYENV_VIRTUALENV_INIT
• _
• PYTHONDONTWRITEBYTECODE
• PIP_SHIMS_BASE_MODULE
• PIP_PYTHON_PATH
• PIPENV_ACTIVE
• PS1
• PYENV_ROOT

Pipenv–specific environment variables:

• PIPENV_ACTIVE: 1

Debug–specific environment variables:

• PATH: /home/megger/.pyenv/plugins/pyenv-virtualenv/shims:/home/megger/.pyenv/shims:/home/megger/.pyenv/bin:/home/megger/.local/bin:/home/megger/.pyenv/plugins/pyenv-virtualenv/shims:/home/megger/.pyenv/shims:/home/megger/.pyenv/bin:/home/megger/.local/bin:/home/megger/.pyenv/plugins/pyenv-virtualenv/shims:/home/megger/.pyenv/shims:/home/megger/.pyenv/bin:/home/megger/.local/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/home/megger/bin
• SHELL: /usr/bin/zsh
• LANG: en_US.UTF-8
• PWD: /home/megger

---

Contents of Pipfile (‘/home/megger/Pipfile’):

[asmaier]

I couldn’t find a workaround for issue #3123 . So my steps how I got Python 3.6.5 working with pipenv and pyenv were

sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
pyenv install 3.6.5
pipenv install --python ~/.pyenv/versions/3.6.5/bin/python

[techalchemy]

between #3159 and #3161 I believe this is covered now, sorry for the bug!