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Asked: 2026-06-09T12:26:20+00:00

Does anyone know if package install order matters in Python? More specifically my pip

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Does anyone know if package install order matters in Python? More specifically my pip requirements.txt for a Django website I am building was:

Django==1.4
MySQL-python==1.2.3
django-evolution==0.6.7
django-pagination==1.0.7
boto==2.5.2
numpy==1.6.2
requests==0.13.1
simplejson==2.5.2
gunicorn==0.14.6

When deploying to Heroku the application would crash with the following error:

2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [12] [INFO] Worker exiting (pid: 12)
2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [8] [INFO] Worker exiting (pid: 8)
2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [4] [INFO] Handling signal: term
2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [7] [INFO] Worker exiting (pid: 7)
2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [4] [INFO] Starting gunicorn 0.14.6
2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [4] [INFO] Listening at: http://0.0.0.0:20132 (4)
2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [4] [INFO] Using worker: sync
2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [7] [INFO] Booting worker with pid: 7
2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [8] [INFO] Booting worker with pid: 8
2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [9] [INFO] Booting worker with pid: 9
2012-08-05T09:26:56+00:00 app[web.1]: 2012-08-05 09:26:56 [10] [INFO] Booting worker with pid: 10
2012-08-05T09:26:57+00:00 heroku[web.1]: State changed from starting to up
2012-08-05T09:26:57+00:00 heroku[web.1]: Process exited with status 143
2012-08-05T09:27:17+00:00 app[web.1]: Usage: gunicorn [options]
2012-08-05T09:27:17+00:00 app[web.1]: gunicorn: error: no such option: --workers
2012-08-05T09:27:17+00:00 app[web.1]: 
2012-08-05T09:27:17+00:00 app[web.1]: 2012-08-05 09:27:17 [9] [INFO] Worker exiting (pid: 9)

Where my Procfile is as follows:

web: python manage.py collectstatic --noinput; gunicorn commerical_production.wsgi:application --workers=4 --bind=0.0.0.0:$PORT

The problem was fixed by simply changing the order of requirements to:

Django==1.4
gunicorn==0.14.6
MySQL-python==1.2.3
django-evolution==0.6.7
django-pagination==1.0.7
boto==2.5.2
numpy==1.6.2
requests==0.13.1
simplejson==2.5.2

(note that gunicorn is now moved to the top)

I found this out by luckily guessing to try and change the order of the imports but my question is has anyone else run into this problem or know why the order of the packages makes a difference when installed from the requirements.txt? Could this problem indicative of some larger dependency issue that is in my app?

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1 Answer

  1. Editorial Team

    Pip is not very good at handling package dependencies as easy_install. We had the same problem in our project. Even though the order in req.txt was correct, we had dependency problems that is related to order.

    My solution is to feed the req.txt to easy_install, but than you should be careful with the packages that is editable or those from github etc.

    You may want to check below links:

    http://metak4ml.blogspot.com/2009/08/easyinstall-read-pip-requirementstxt.html
    http://community.webfaction.com/questions/1220/using-easy_install-to-get-all-dependencies-listed-in-requirementstxt (while read line answer is close to what we do)

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