#35395: Python 3.12 filter bug with Django 4.2.11 ---------------------------------+-------------------------------------- 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 ---------------------------------+-------------------------------------- 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> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/0107018f058f97bb-6a210c61-449d-4b8c-b742-3f82e23df723-000000%40eu-central-1.amazonses.com.