[Python] How to resolve VSCode Pylance type checking error in Django

I'm encountering a type checking error in VSCode with Pylance when accessing serializer.validated_data["code"] in a Django project. The errors are:

• "__getitem__" method not defined on type "empty" Pylance
• Object of type "None" is not subscriptable Pylance

The property type is inferred as:
(property) validated_data: empty | Unknown | dict[Unknown, Unknown] | Any | None

VSCode settings:

"python.languageServer": "Pylance",
"python.analysis.typeCheckingMode": "basic"


I've defined the serializer class like,

class InputSerializer(BaseSerializer):
code = serializers.CharField(
required=True,
max_length=255,
validators=[voucher_code_validator],
)


How can I fix this?

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