pipenv fails to create a virtual environment with specific version of python

### Issue description

Unable to install using a specific version of python (3.6.5). Here is how to reproduce:

```
[pipenv-test]$ which python3
/usr/local/bin/python3
[pipenv-test]$ python3 --version
Python 3.7.1
[pipenv-test]$ brew list --versions python
python 3.7.0 3.7.1 3.6.3 3.6.5 2.7.14
[pipenv-test]$ pipenv install --python 3.6.5
Warning: Python 3.6.5 was not found on your system…
You can specify specific versions of Python with:
  $ pipenv --python path/to/python
[pipenv-test]$ pipenv install --python /usr/local/Cellar/python/3.6.5/bin/python3
```

### Expected result

A Virtual environment be created with python 3.6.5.

### Actual result

```
Creating a virtualenv for this project…
Pipfile: /Users/ramin/projects/test/pipenv-test/Pipfile
Using /usr/local/Cellar/python/3.6.5/bin/python3 (3.6.5) to create virtualenv…
⠴Running virtualenv with interpreter /usr/local/Cellar/python/3.6.5/bin/python3
Using base prefix '/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6'
New python executable in /Users/ramin/.local/share/virtualenvs/pipenv-test-lmVJ1RwT/bin/python3.6
Traceback (most recent call last):
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/virtualenv.py", line 2343, in <module>
    main()
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/virtualenv.py", line 712, in main
    symlink=options.symlink)
  File "/usr/local/Cellar/pipenv/2018.10.13_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/2018.10.13_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'

Traceback (most recent call last):
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/bin/pipenv", line 11, in <module>
    load_entry_point('pipenv==2018.10.13', 'console_scripts', 'pipenv')()
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/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/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/vendor/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/Cellar/pipenv/2018.10.13_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/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/cli/command.py", line 249, in install
    editable_packages=state.installstate.editables,
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/core.py", line 1724, in do_install
    pypi_mirror=pypi_mirror,
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/core.py", line 565, in ensure_project
    pypi_mirror=pypi_mirror,
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/core.py", line 500, in ensure_virtualenv
    python=python, site_packages=site_packages, pypi_mirror=pypi_mirror
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/core.py", line 901, in do_create_virtualenv
    click.echo(crayons.blue("{0}".format(c.err)), err=True)
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/vendor/delegator.py", line 146, in err
    return self._pexpect_out
  File "/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv/vendor/delegator.py", line 114, in _pexpect_out
    result += self.subprocess.after
TypeError: can only concatenate str (not "type") to str
```

### Steps to replicate

See above.

-------------------------------------------------------------------------------

<details><summary>$ pipenv --support</summary>

Pipenv version: `'2018.10.13'`

Pipenv location: `'/usr/local/Cellar/pipenv/2018.10.13_1/libexec/lib/python3.7/site-packages/pipenv'`

Python location: `'/usr/local/Cellar/pipenv/2018.10.13_1/libexec/bin/python3.7'`

Python installations found:

  - `3.7.1`: `/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/bin/python3.7`
  - `3.7.1`: `/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/bin/python3.7m`
  - `2.7.15`: `/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/bin/python2.7`
  - `2.7.10`: `/usr/bin/python`
  - `2.7.10`: `/usr/bin/pythonw`
  - `2.7.10`: `/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7`

PEP 508 Information:

```
{'implementation_name': 'cpython',
 'implementation_version': '3.7.1',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '18.2.0',
 'platform_system': 'Darwin',
 'platform_version': 'Darwin Kernel Version 18.2.0: Fri Oct  5 19:41:49 PDT '
                     '2018; root:xnu-4903.221.2~2/RELEASE_X86_64',
 'python_full_version': '3.7.1',
 'python_version': '3.7',
 'sys_platform': 'darwin'}
```

System environment variables:

  - `PATH`
  - `TERM_PROGRAM`
  - `rvm_bin_path`
  - `NVM_CD_FLAGS`
  - `GEM_HOME`
  - `ANDROID_HOME`
  - `SHELL`
  - `TERM`
  - `CLICOLOR`
  - `IRBRC`
  - `TMPDIR`
  - `Apple_PubSub_Socket_Render`
  - `TERM_PROGRAM_VERSION`
  - `MY_RUBY_HOME`
  - `TERM_SESSION_ID`
  - `USER`
  - `NVM_DIR`
  - `COMMAND_MODE`
  - `_system_type`
  - `rvm_path`
  - `SSH_AUTH_SOCK`
  - `__CF_USER_TEXT_ENCODING`
  - `LSCOLORS`
  - `rvm_prefix`
  - `_`
  - `PWD`
  - `LANG`
  - `ITERM_PROFILE`
  - `_system_arch`
  - `XPC_FLAGS`
  - `_system_version`
  - `XPC_SERVICE_NAME`
  - `rvm_version`
  - `COLORFGBG`
  - `SHLVL`
  - `HOME`
  - `ITERM_SESSION_ID`
  - `LOGNAME`
  - `GEM_PATH`
  - `NVM_BIN`
  - `GOPATH`
  - `PROMPT_COMMAND`
  - `DISPLAY`
  - `SECURITYSESSIONID`
  - `RUBY_VERSION`
  - `_system_name`
  - `COLORTERM`
  - `PYTHONDONTWRITEBYTECODE`
  - `PIP_SHIMS_BASE_MODULE`
  - `PIP_PYTHON_PATH`

Pipenv–specific environment variables:


Debug–specific environment variables:

  - `PATH`: `/usr/local/Cellar/pipenv/2018.10.13_1/libexec/tools:/Users/ramin/.rvm/gems/ruby-2.3.5/bin:/Users/ramin/.rvm/gems/ruby-2.3.5@global/bin:/Users/ramin/.rvm/rubies/ruby-2.3.5/bin:/Users/ramin/.nvm/versions/node/v6.10.1/bin:/usr/local/heroku/bin:/Library/PostgreSQL/9.4/bin:/Users/ramin/android-sdks:/opt/local/bin:/opt/local/sbin:/usr/local/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/usr/local/git/bin:/usr/local/sbin:/Users/ramin/Library/Android/sdk/tools:/Users/ramin/Library/Android/sdk/platform-tools:/usr/local/opt/go/libexec/bin:/Users/ramin/projects/go/bin:/Users/ramin/.rvm/bin`
  - `SHELL`: `/usr/local/bin/bash`
  - `LANG`: `en_CA.UTF-8`
  - `PWD`: `/Users/ramin/projects/test/pipenv-test`


---------------------------

Contents of `Pipfile` ('/Users/ramin/projects/test/pipenv-test/Pipfile'):

```toml

```

</details>


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pipenv fails to create a virtual environment with specific version of python #3210

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pipenv fails to create a virtual environment with specific version of python #3210

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pqiaohaoq commented on Nov 13, 2018

techalchemy commented on Nov 13, 2018

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