#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
Comment (by Tim Richardson):

 Fair enough.

 The code below is the slice_filter from the 4.2.11 source.

 If you run this code in python 3.11,
 the filter returns

 (an empty dict)

 If you run it in python 3.12, it raises an exception.

 Traceback (most recent call last):
   File "/app/./test_filter.py", line 21, in <module>
     r = slice_filter({},":5")
   File "/app/./test_filter.py", line 13, in slice_filter
     return value[slice(*bits)]
 KeyError: slice(None, 5, None)

 def slice_filter(value, arg):
     Return a slice of the list using the same syntax as Python's list
         bits = []
         for x in str(arg).split(":"):
             if not x:
         return value[slice(*bits)]
     except (ValueError, TypeError) as e:
         return value  # Fail silently.

 if __name__ == "__main__":
     r = slice_filter({},":5")

 I will try to work out why, but this at least describes the problem I
Ticket URL: <https://code.djangoproject.com/ticket/35395#comment:3>
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