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A QAPISchemaArrayType's element type gets resolved only during .check(). We have QAPISchemaArrayType.__init__() initialize self.element_type = None, and .check() assign the actual type. Using .element_type before .check() is wrong, and hopefully crashes due to the value being None. Works. However, it makes for awkward typing. With .element_type: Optional[QAPISchemaType], mypy is of course unable to see that it's None before .check(), and a QAPISchemaType after. To help it over the hump, we'd have to assert self.element_type is not None before all the (valid) uses. The assertion catches invalid uses, but only at run time; mypy can't flag them. Instead, declare .element_type in .__init__() as QAPISchemaType *without* initializing it. Using .element_type before .check() now certainly crashes, which is an improvement. Mypy still can't flag invalid uses, but that's okay. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-ID: <20240315152301.3621858-8-armbru@redhat.com> |
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| .. | ||
| .flake8 | ||
| .isort.cfg | ||
| __init__.py | ||
| commands.py | ||
| common.py | ||
| error.py | ||
| events.py | ||
| expr.py | ||
| gen.py | ||
| introspect.py | ||
| main.py | ||
| mypy.ini | ||
| parser.py | ||
| pylintrc | ||
| schema.py | ||
| source.py | ||
| types.py | ||
| visit.py | ||