#35395: Python 3.12 filter bug with Django 4.2.11
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Reporter: Tim Richardson | Owner: nobody
Type: Bug | Status: closed
Component: Template system | Version: 4.2
Severity: Normal | Resolution: needsinfo
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by Tim Graham):
* resolution: => needsinfo
* status: new => closed
Old description:
> I have a template with a fragment like this:
>
> <span
> class="fs-6">Supplier: {{
> po_metadata|get_item:dict_item.PONumber|get_item:"supplier" }} PO Date:
> {{ po_metadata|get_item:dict_item.PONumber|get_item:"order_date" |
> slice:":10" }} </span>
>
> When using python 3.13.2, I get an exception in
> django/template/defaultfilters.py slice_filter()
>
> This code does not throw an exception with 3.11
>
> The exception is a Key Error and it happens because instead a list being
> passed to the filter, a dictionary is. An empty dict in my case.
>
> In python 3.11, the breakpoints in slice_filter() are not hit. Somehow
> the preceeding filters are behaving differently in case of po_metadata
> being an empty dict.
New description:
I have a template with a fragment like this:
`<span class="fs-6">Supplier: {{
po_metadata|get_item:dict_item.PONumber|get_item:"supplier" }} PO Date: {{
po_metadata|get_item:dict_item.PONumber|get_item:"order_date" |
slice:":10" }} </span>`
When using python 3.13.2, I get an exception in
django/template/defaultfilters.py slice_filter()
This code does not throw an exception with 3.11
The exception is a Key Error and it happens because instead a list being
passed to the filter, a dictionary is. An empty dict in my case.
In python 3.11, the breakpoints in slice_filter() are not hit. Somehow
the preceeding filters are behaving differently in case of po_metadata
being an empty dict.
--
Comment:
Hi Tim, You haven't provided complete steps to reproduce the issue as your
snippet involves custom template filters. The issue may be in those
filters. You should debug the problem and confirm that Django is at fault.
If so, reopen the issue with an explanation. See
TicketClosingReasons/UseSupportChannels if you need help.
--
Ticket URL: <https://code.djangoproject.com/ticket/35395#comment:2>
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