Re: virtualenv on Windows

On 29/01/2014 7:10pm, Sam Lai wrote:
> Oops, my memory failed me. They don't work with pip, but they do work
> with easy_install, which virtualenvs have as well (at least mine do).
>
> http://stackoverflow.com/a/5442340/150999
>
> For example,
>
> easy_install C:\Users\sam\Downloads\Pygments-1.6.win-amd64-py2.7.exe

Thanks Sam - I'll rework my experience :)


>
>
>
> On 29 January 2014 16:27, Mike Dewhirst <miked@dewhirst.com.au> wrote:
>> On 29/01/2014 2:23pm, Sam Lai wrote:
>>>>
>>>> However, even after downloading from that site they cannot be installed
>>>> manually into a virtualenv! Only pip can do that.
>>>
>>>
>>> You can install the packages from
>>> http://www.lfd.uci.edu/~gohlke/pythonlibs/ by simply running -
>>>
>>> pip install <path to the .exe file>
>>
>>
>> I did try that earlier but had no luck. Maybe I got the incantation wrong?
>>
>> (proj-x) C:\users\miked\env\proj-x>pip install
>> C:\install_kits\python\postgresql\psycopg2-2.4.5.win32-py2.7.exe
>>
>> Exception:
>> Traceback
>> ...
>> ValueError: ('Missing distribution spec',
>> '\\install_kits\\python\\postgresql\\psycopg2-2.4.5.win32-py2.7.exe')
>>
>> Mike
>>
>>
>>>
>>> ... from inside your virtualenv. Those .exe files are pip-compatible
>>> ZIP archives
>>>
>>> On 29 January 2014 13:56, Mike Dewhirst <miked@dewhirst.com.au> wrote:
>>>>
>>>> A little while ago I suggested to someone using Windows to implement
>>>> virtualenv "later". So I thought I'd document my experience here.
>>>>
>>>> In summary, it probably works well if you have Visual Studio. The process
>>>> outlined below shows a clumsy workaround if you don't.
>>>>
>>>> Hope it helps someone
>>>>
>>>> Mike
>>>>
>>>> - - - - - -
>>>>
>>>> $pip install virtualenv # first step (requires pip obviously)
>>>>
>>>> $mkdir c:\users\miked\env
>>>>
>>>> $virtualenv --no-site-packages c:\users\miked\env\proj-x
>>>> New python executable in c:\users\miked\env\proj-x\Scripts\python.exe
>>>> Installing setuptools, pip...done.
>>>>
>>>> Now copy your "myproject-x" into c:\users\miked\env\proj-x\myproject-x
>>>>
>>>> At this point on Linux one would install virtualenv-wrapper but that is
>>>> unfortunately not available for Windows so a simple workaround is ...
>>>>
>>>> 1. mkdir \users\miked\bin # could be anything eg \users\miked\bat
>>>>
>>>> 2. Add C:\users\miked\bin to the path environment variable
>>>>
>>>> 3. Create a batch file called C:\users\miked\bin\proj-x.bat containing:
>>>>
>>>> cd \users\miked\env\proj-x\myproject-x
>>>> ..\Scripts\activate
>>>>
>>>> 4. Create another batch file
>>>> C:\users\miked\env\proj-x\myproject-x\exit.bat
>>>> containing:
>>>>
>>>> cd \users\miked\
>>>> \users\miked\env\proj-x\Scripts\deactivate
>>>>
>>>> 5. Test the workaround by opening a command prompt somewhere and entering
>>>> proj-x. You should see:
>>>>
>>>> C:\Documents and Settings\Mike Dewhirst\Desktop>cd
>>>> \users\miked\env\proj-x\myproject-x
>>>>
>>>> C:\users\miked\env\proj-x\myproject-x>..\Scripts\activate
>>>> (proj-x) C:\users\miked\env\proj-x\myproject-x>
>>>>
>>>> 6. Test the exit batch file by entering exit at that command prompt:
>>>>
>>>> C:\users\miked\env\proj-x\myproject-x>..\Scripts\activate
>>>> (proj-x) C:\users\miked\env\proj-x\myproject-x>exit
>>>>
>>>> (proj-x) C:\users\miked\env\proj-x\myproject-x>cd \users\miked\
>>>>
>>>> (proj-x) C:\users\miked>\users\miked\env\proj-x\Scripts\deactivate
>>>> C:\users\miked>
>>>>
>>>> This should let you get into and out of the virtualenv quite easily.
>>>>
>>>> Now comes the difficult bit for Windows - installing stuff in the new
>>>> Python's site-packages. First, though, discover what you already have
>>>> installed in your main site-packages:
>>>>
>>>> pip freeze > requirements.txt # lists existing site-packages
>>>>
>>>> Here is mine, most of which I don't want in proj-x
>>>>
>>>> Django==1.5.4
>>>> Jinja2==2.7.1
>>>> MarkupSafe==0.18
>>>> Pygments==1.6
>>>> South==0.7.6
>>>> Sphinx==1.1.3
>>>> coverage==3.7
>>>> django-discover-runner==1.0
>>>> docutils==0.9.1
>>>> filemov==1.1.1-2728-py2.7
>>>> pillow==2.3.0
>>>> pss==1.38
>>>> psycopg2==2.4.5
>>>> py2exe==0.6.9
>>>> pytz==2012h
>>>> pywin32==218
>>>> virtualenv==1.11.2
>>>>
>>>> So I edit it down to the following, create a directory and save it as
>>>> C:\users\miked\env\proj-x\requirements\requirements.txt
>>>>
>>>> Django==1.5.4
>>>> South==0.7.6
>>>> coverage==3.7
>>>> django-discover-runner==1.0
>>>> pillow==2.3.0
>>>> psycopg2==2.4.5
>>>> pytz==2013.9
>>>>
>>>> pip install -r C:\users\miked\env\proj-x\requirements\requirements.txt
>>>>
>>>> And this where (my) problems start. First pip will download the packages
>>>> successfully but I don't have Visual Studio installed so those packages
>>>> requiring compilation don't get installed. Here is a snippet of pip
>>>> output
>>>> after the downloads:
>>>>
>>>> Installing collected packages: Django, South, coverage,
>>>> django-discover-runner, pillow, psycopg2, pytz
>>>> Running setup.py install for Django
>>>>
>>>> ... and so on until errors start to appear. In my case the signal is:
>>>>
>>>> error: Unable to find vcvarsall.bat
>>>>
>>>> Afterwards, pip freeze shows:
>>>>
>>>> (proj-x) C:\users\miked\env\proj-x>pip freeze
>>>> Django==1.5.4
>>>> South==0.7.6
>>>> coverage==3.7
>>>> django-discover-runner==1.0
>>>>
>>>> ... which indicates pillow, psycopg2 and pytz did not install.
>>>>
>>>> But how come they were installed in the main site-packages? That's
>>>> because
>>>> they were originally downloaded from
>>>> http://www.lfd.uci.edu/~gohlke/pythonlibs/ and installed manually.
>>>>
>>>> However, even after downloading from that site they cannot be installed
>>>> manually into a virtualenv! Only pip can do that. The only workaround I
>>>> have
>>>> found is to manually copy them from the main site-packages to the new
>>>> virtualenv site-packages. Clumsy.
>>>>
>>>> My proj-x requirements.txt file now looks like this ...
>>>>
>>>> Django==1.5.4
>>>> South==0.7.6
>>>> coverage==3.7
>>>> django-discover-runner==1.0
>>>> # pillow==2.3.0 http://www.lfd.uci.edu/~gohlke/pythonlibs/
>>>> # psycopg2==2.4.5 http://www.lfd.uci.edu/~gohlke/pythonlibs/
>>>> # pytz==2013.9 http://www.lfd.uci.edu/~gohlke/pythonlibs/
>>>>
>>>> After the above clumsy workaround everything works well and pip freeze
>>>> displays ...
>>>>
>>>> Django==1.5.4
>>>> South==0.7.6
>>>> coverage==3.7
>>>> django-discover-runner==1.0
>>>> pillow==2.3.0
>>>> psycopg2==2.4.5
>>>> pytz==2013.9
>>>>
>>>>
>>>>
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>>>
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