id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
35816	Django Template Language doesn't support all float literals	Lily Foote	Hailey Johnson	"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."	Bug	closed	Template system	5.1	Normal	fixed			Ready for checkin	1	0	0	0	0	0