Weird variable setting in python

Question

I'm currently doing tutorial for django-rest-framework.
I've noticed something weird in it, I'm not sure if it is specific for Django or whole Python. Please look at code below:

linenos = self.linenos and 'table' or False

It looks like shortened version of conditional instruction, but what is name of that operation? I can't find any specific information about it.

lineos is a boolean variable.

RemcoGerlich · Accepted Answer · 2015-12-13 13:50:08Z

3

Read it like

linenos = (self.linenos and 'table') or False

Which returns 'table' if self.linenos is trueish, and False otherwise, due to the way that and and or are evaluated.

In modern Python we would write that using the ternary expression as

linenos = 'table' if self.linenos else False

answered Dec 13, 2015 at 13:50

RemcoGerlich

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Comments

codeme · Accepted Answer · 2015-12-13 13:15:21Z

0

It is tri conditional flow
If self.linenos is true it assigns table to linenos or else False
we can also chain this flow for multiple conditions
This is just like var=condition1?12:3 in most other languages

answered Dec 13, 2015 at 13:15

codeme

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