title: Pipenv Install RuntimeError: location not created nor specified
body: <p>I am using Pipenv to manage project dependencies. It was working fine so far until now. Now I am trying to bootstrap an environment with <code>pipenv install</code> and I am getting the following error:</p>
  
  <pre class="lang-sh prettyprint-override"><code>❯ pipenv install --dev --skip-lock
  Creating a virtualenv for this project…
  Pipfile: /Users/user/project/Pipfile
  Using /usr/bin/python3 (3.7.3) to create virtualenv…
  ⠧ Creating virtual environment...created virtual environment CPython3.7.3.final.0-64 in 399ms
    creator CPython3Posix(dest=/Users/user/.local/share/virtualenvs/sql_runner-ABIm84c6, clear=False, global=False)
    seeder FromAppData(download=False, pip=latest, setuptools=latest, wheel=latest, via=copy, app_data_dir=/Users/user/Library/Application Support/virtualenv/seed-app-data/v1)
    activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator
  
  ✔ Successfully created virtual environment!
  Virtualenv location: /Users/user/.local/share/virtualenvs/sql_runner-ABIm84c6
  Traceback (most recent call last):
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/bin/pipenv", line 8, in &lt;module&gt;
      sys.exit(cli())
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 764, in __call__
      return self.main(*args, **kwargs)
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 717, in main
      rv = self.invoke(ctx)
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 1137, in invoke
      return _process_result(sub_ctx.command.invoke(sub_ctx))
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
      return ctx.invoke(self.callback, **ctx.params)
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
      return callback(*args, **kwargs)
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
      return ctx.invoke(f, obj, *args, **kwargs)
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
      return callback(*args, **kwargs)
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/vendor/click/decorators.py", line 17, in new_func
      return f(get_current_context(), *args, **kwargs)
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/cli/command.py", line 235, in install
      retcode = do_install(
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/core.py", line 1734, in do_install
      ensure_project(
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/core.py", line 579, in ensure_project
      path_to_python = which("python") or which("py")
    File "/usr/local/Cellar/pipenv/2018.11.26_4/libexec/lib/python3.8/site-packages/pipenv/core.py", line 108, in which
      raise RuntimeError("location not created nor specified")
  RuntimeError: location not created nor specified
  </code></pre>
  
  <p>The Pipfile is the following</p>
  
  <pre><code>[[source]]
  name = "pypi"
  url = "https://pypi.org/simple"
  verify_ssl = true
  
  [dev-packages]
  pytest     = "==4.6.3"
  flake8     = "==3.7.7"
  autopep8   = "==1.4.4"
  pytest-cov = "==2.7.1"
  moto       = "==1.3.13"
  Sphinx     = "==2.3.1"
  
  [packages]
  psycopg2-binary          = "==2.8.2"
  boto3                    = "==1.9.166"
  pymongo                  = "==3.8.0"
  deprecated               = "==1.2.5"
  paramiko                 = "==2.6.0"
  pandas                   = "==0.24.2"
  pyarrow                  = "==0.14.0"
  SQLAlchemy               = "==1.3.15"
  s3fs                     = "==0.4.0"
  
  [requires]
  python_version = "3.7"
  </code></pre>
  
  <p>I have installed Pipenv with Homebrew. I am not sure what could have changed to stop working. Other older projects keep working, but every time that I try to create an environment I get this error.</p>
  
  <p>Thanks!</p>