Django display formated string with tuple data (called only once)

Question

I want to display tuple data in a django template.

I want to use a syntax like the Python formated string :

print("I have %d referrers and %f cashbacks" % request.user.get_referrer_data())

In this case, request.user.get_referrer_data() is an expensive method, so I want called it only once in my template (despite the fact that I cache its result).

Do you know a template syntax that let me inject a tuple in a string ?

A code like that would be great :

{{ "I have %d referrers and %f cashbacks" | formated_string request.user.get_referrer_data() }}

Samuel Dauzon · Accepted Answer · 2020-02-04 23:05:26Z

1

Use {% with ...

{% with rdata=request.user.get_referrer_data %}

I have {{ rdata.0 }} referrers and {{ rdata.1 }} cashbacks

{% endwith %}

To get greater control over the formatting of the values use a filter. Django provides floatformat for float values:

{{ rdata.1|floatformat:2 }}

gives two decimal places.

edited Feb 4, 2020 at 23:05

Samuel Dauzon

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answered Feb 4, 2020 at 9:46

nigel222

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2 Comments

Samuel Dauzon Over a year ago

Big thanks it's perfect. It require just no spaces near = sign.

nigel222 Over a year ago

There's an alternative syntax with request.user.get_referrer_data as rdata if you want spaces. I don't think it's deprecated, though it's referred to as "old syntax" in new docs.

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