Homebrew-installed Pipenv defaults to Homebrew-created virtualenv Python

As following log, it will use /usr/local/Cellar/pipenv/2018.5.18/libexec/bin/python3.6, instead of use system installed python

🚀  pipenv install --dev
Warning: the environment variable LANG is not set!
We recommend setting this in ~/.profile (or equivalent) for proper expected behavior.
Creating a virtualenv for this project…
Using /usr/local/Cellar/pipenv/2018.5.18/libexec/bin/python3.6 (3.6.5) to create virtualenv…
⠋Already using interpreter /usr/local/Cellar/pipenv/2018.5.18/libexec/bin/python3.6
Using real prefix '/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6'
New python executable in /Users/aweimeow/pipenv/.venv/bin/python3.6
Also creating executable in /Users/aweimeow/pipenv/.venv/bin/python
Installing setuptools, pip, wheel...done.

Virtualenv location: /Users/aweimeow/pipenv/.venv
Installing dependencies from Pipfile.lock (ae475c)…
Ignoring colorama: markers 'sys_platform == "win32"' don't match your environment
Ignoring configparser: markers 'python_version < "3.2"' don't match your environment
Ignoring enum34: markers 'python_version < "3.4"' don't match your environment
Ignoring funcsigs: markers 'python_version < "3.0"' don't match your environment
Ignoring stdeb: markers 'sys_platform == "linux"' don't match your environment
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To activate this project's virtualenv, run the following:
 $ pipenv shell

[alper]

@nathanielford Side note: Personally I strongly discourage using Homebrew to install Python packages, or install any Python packages against the Homebrew Python using pip (or otherwise). It is just not a good idea.

Please then remove brew install pipenv out of the documentation. I had the same thing where I had to go back to python3.6 and now my homebrew pipenv is broken. If pip install is the preferred way, I’m perfectly happy to do that.

[nathanielford]

I’m having a related issue, I think, wherein Homebrew has installed both 3.6.5 and 3.7.0. With the latter active, running pipenv against the former yields an error:

nford@Nathaniels-MacBook-Pro:~/repos/deploy-apps $ pipenv --python /usr/local/Cellar/python/3.6.5/bin/python3.6
Creating a virtualenv for this project...
Pipfile: /Users/nmford/repos/deploy-apps/Pipfile
Using /usr/local/Cellar/python/3.6.5/bin/python3.6 (3.6.5) to create virtualenv...
⠋Running virtualenv with interpreter /usr/local/Cellar/python/3.6.5/bin/python3.6
Using base prefix '/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6'
New python executable in /Users/nmford/.local/share/virtualenvs/deploy-apps-sdEHSK2F/bin/python3.6
Traceback (most recent call last):
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/virtualenv.py", line 2343, in <module>
    main()
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/virtualenv.py", line 712, in main
    symlink=options.symlink)
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/virtualenv.py", line 927, in create_environment
    site_packages=site_packages, clear=clear, symlink=symlink))
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/virtualenv.py", line 1233, in install_python
    shutil.copyfile(executable, py_executable)
  File "/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6/lib/python3.6/shutil.py", line 120, in copyfile
    with open(src, 'rb') as fsrc:
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/opt/python/bin/python3.6'

Virtualenv location:
Traceback (most recent call last):
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/bin/pipenv", line 11, in <module>
    load_entry_point('pipenv==2018.7.1', 'console_scripts', 'pipenv')()
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 1043, in invoke
    return Command.invoke(self, ctx)
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/pipenv/cli.py", line 294, in cli
    three=three, python=python, warn=True, site_packages=site_packages, pypi_mirror=pypi_mirror
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/pipenv/core.py", line 614, in ensure_project
    path_to_python = which('python') or which('py')
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/lib/python3.7/site-packages/pipenv/core.py", line 115, in which
    p = os.path.join(location, 'bin', command)
  File "/usr/local/Cellar/pipenv/2018.7.1/libexec/bin/../lib/python3.7/posixpath.py", line 80, in join
    a = os.fspath(a)
TypeError: expected str, bytes or os.PathLike object, not NoneType

Given the way Homebrew handles this (it unlinks the files in /usr/local/opt/python/bin/) I’m not sure there is a good way around the matter. I tried installing brew install pipenv under python 3.6, but it just used homebrew to install and switch to 7, so trying to keep things manually aligned didn’t work either.