Slice the string from Django template tag's variable

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Is it possible to slice the string from Django template tag's variable?

Let's say some_variable contain "abcde" I want it to be sliced to be "abc"

On Django's template, I tried like this.

{{some_variable[:-2]}}

It does not work.

If it's possible to slice words from Django template tag's variable, please advise me how to do it.

django-templates django python
1 Answers

Yes, you can work with the |slice template filter [Django-doc]:

{{ some_variable|slice:":-2" }}

This works both for lists and strings. For example:

>>> from django.template import Template, Context
>>> Template('{{ foo|slice:":-2" }}').render(Context({'foo': 'abcde'}))
'abc'

Using {{ some_variable[:-2] }} is not possible: Django's template language does not allow function calls, subscripting, operators, etc. Only a sublanguage of Python is supported, mainly to prevent people from writing business logic in the templates.

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