[Tutor] can't install

[Tobias M.]

Quoting "Tobias M." <tm at tobix.eu>:
> Quoting Lolo Lolo <losermeloser at yahoo.com>:
>>
>> Hi Tobias can i just ask. As i already have Python 3.3, when i  
>> install this separate version of 3.3, will there be a conflict on  
>> the command line when i type python3.3? This install i want just  
>> for virtualenvs but i wonder if it would replace my other 3.3 as  
>> the default on the command line?
>>
>
> As long as you install the new 3.3 build in a custom path (via  
> --prefix) it will not overwrite your current installation and by  
> default python3.3 will invoke the standard installation (probably in  
> your /usr directory).
> To use your custom build in virtualenvs make sure you create the  
> virtualenv with the python interpreter of that build (the one in the  
> <prefix>/bin directory). Your virtualenv will link to this  
> installation and when your virtualenv is active, python3.3 will  
> invoke the interpreter from your own build.
>
> I hope this explaination is understandable (and correct), if not  
> just ask. When using virtualenvs the first time I found it very  
> confusing, too.
>

Another hint, if you are not sure which interpreter is started when  
using "python3.3" at the command line:
In interactive mode the date and time of the build are displayed at  
the beginning and you can get the full path of the current python  
interpreter with:

import sys
sys.executable