Opened 5 hours ago
Last modified 5 hours ago
#35816 new Uncategorized
Django Template Language doesn't support all float literals
Reported by: | Lily Foote | Owned by: | |
---|---|---|---|
Component: | Uncategorized | Version: | 5.1 |
Severity: | Normal | Keywords: | |
Cc: | Triage Stage: | Unreviewed | |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description
When parsing arguments to filters, Django converts numeric literals to float
or int
, but in the case of scientific notation for float
this is incomplete:
>>> from django.template.base import Template >>> from django.template.engine import Engine >>> 5.2e3 5200.0 >>> Template("{{ foo|default:5.2e3 }}", engine=e) <Template template_string="{{ foo|default:5.2e3..."> >>> 5.2e-3 0.0052 >>> Template("{{ foo|default:5.2e-3 }}", engine=e) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/lily/.local/share/lilyenv/virtualenvs/django-rusty-templates/3.12/lib/python3.12/site-packages/django/template/base.py", line 154, in __init__ self.nodelist = self.compile_nodelist() ^^^^^^^^^^^^^^^^^^^^^^^ File "/home/lily/.local/share/lilyenv/virtualenvs/django-rusty-templates/3.12/lib/python3.12/site-packages/django/template/base.py", line 196, in compile_nodelist nodelist = parser.parse() ^^^^^^^^^^^^^^ File "/home/lily/.local/share/lilyenv/virtualenvs/django-rusty-templates/3.12/lib/python3.12/site-packages/django/template/base.py", line 489, in parse raise self.error(token, e) File "/home/lily/.local/share/lilyenv/virtualenvs/django-rusty-templates/3.12/lib/python3.12/site-packages/django/template/base.py", line 487, in parse filter_expression = self.compile_filter(token.contents) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/lily/.local/share/lilyenv/virtualenvs/django-rusty-templates/3.12/lib/python3.12/site-packages/django/template/base.py", line 605, in compile_filter return FilterExpression(token, self) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/lily/.local/share/lilyenv/virtualenvs/django-rusty-templates/3.12/lib/python3.12/site-packages/django/template/base.py", line 706, in __init__ raise TemplateSyntaxError( django.template.exceptions.TemplateSyntaxError: Could not parse the remainder: '-3' from 'foo|default:5.2e-3'
I couldn't actually find the documentation for Django's handling of numeric literals in templates, so this may be an undocumented implementation detail. If so, perhaps deprecating scientific notation would be appropriate. Otherwise, we should support this case.
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