What is the difference between context.push() and context.update() in Django Context

Question

From the documentation, I understand that the context object is a stack. Then what are push() and update() doing with respect to this code segment? It is stated in the doc that push() and update() are similar but update() takes a dictionary as argument. Then why are we using them simultaneously here?

import django.template
import django.template.loader

def render(name, *values):
    ctx = django.template.Context()
    for d in values:
        ctx.push()
        ctx.update(d)

    t = django.template.loader.get_template(name)
    return str(t.render(ctx))

Also, what is the need of having context object as a stack?

Edit : I went through the doc again and found the flatten() function which flattens all the levels in the stack to make them comparable.

You are welcome. As long as you take notes and properly format your next post, my work is done ;) — Neuron, Apr 16 '18 at 13:08

score 0 · Accepted Answer · answered Apr 15 '18 at 21:15

0

The only difference seems to be (also according to the tests) the way you pass arguments into the call. Update takes a dictionary while push takes keyword arguments.

And about the usefulness, the documentation says:

Using a Context as a stack comes in handy in some custom template tags.

answered Apr 15 '18 at 21:15

Alper

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The way I get this is Update = Push + Change. Is this correct ? – Varad Bhatnagar Apr 15 '18 at 21:37
No, I think it is really the same, just the arguments passed (if any) are different. – Alper Apr 17 '18 at 20:51
Do you have any clue why both are being in the same iteraion used in this code segment here ? Wouldn't it create an empty level in the stack at every alternate position ? – Varad Bhatnagar Apr 18 '18 at 10:50

What is the difference between context.push() and context.update() in Django Context

1 Answers1