Force virtualenv pip to be used

[Peter Otten]

Chris Angelico wrote:

> On Sun, Nov 6, 2016 at 9:17 PM, Alec Taylor <alec.taylor6 at gmail.com>
> wrote:
>> Running Ubuntu 16.10 with Python 2.7.12+ (default one) and virtualenv
>> 15.0.3 (`sudo -H pip install virtualenv`). What am I doing wrong?
>>
>>     $ virtualenv a && . "$_"/bin/activate && pip --version
> 
> I'm pretty sure virtualenv (like venv, about which I'm certain)
> creates something that you have to 'source' into your shell, rather
> than running in the classic way:
> 
> source env/bin/activate

I think this is what the

. "$_"/bin/activate

part of Alec's command is supposed to do. 

Yes, that's a dot, not grit on Tim's screen ;)

> It needs to alter environment variables in your shell, which can't be
> done from a separate program.