#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
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Comment (by Tim Richardson):
the slice() function is being interpreted as key in 3.12 but not in prior
python versions.
the calculation of
bits
is identical.
Python 3.12 docs say that slice objects are now hashable, so it gets
treated as a key I suppose.
I wonder how it worked in prior python versions.
Including KeyError in the caught exceptions restores consistent behaviour.
{{{
def slice_filter(value, arg):
"""
Return a slice of the list using the same syntax as Python's list
slicing.
"""
try:
bits = []
for x in str(arg).split(":"):
if not x:
bits.append(None)
else:
bits.append(int(x))
return value[slice(*bits)]
except (ValueError, TypeError, KeyError):
return value # Fail silently.
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/35395#comment:4>
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