Ponytech

Django deployement : ubuntu, upstart, nginx, gunicorn and virtualenvwrapper

Update 2019: the stack described here is now considered obsolete. Please see our new way of deploying Django apps.

Check all items in a list are contained in an other list

In some code I wrote today I needed a way to check that all items in a list are contained in an other list. And I came up with a one-liner I found useful enough for sharing :

>>> big_list = [1,2,3]
>>> small_list = [1,3]
>>> all([i in big_list for i in small_list])
True
>>> small_list = [1,4]
>>> all([i in big_list for i in small_list])
False

Save a model without triggering a signal nor the save() method

It happens you may want to save one of your model but without triggering any pre_save / post_save signal, nor the save() method of your model. Reasons could be, your are restoring some fixtures data, you don't want to update the object modification date that is configured with auto_now = True, you want to skip some validations, etc.

There had been a ticket opened in the past to request such a ...