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from dataclasses import dataclass
from apischema import deserialize, deserializer
from apischema.json_schema import deserialization_schema
@dataclass
class Expression:
value: int
@deserializer
def evaluate_expression(expr: str) -> Expression:
return Expression(int(eval(expr)))
# Could be shorten into deserializer(Expression), because class is callable too
@deserializer
def expression_from_value(value: int) -> Expression:
return Expression(value)
assert deserialization_schema(Expression) == {
"$schema": "http://json-schema.org/draft/2020-12/schema#",
"type": ["string", "integer"],
}
assert deserialize(Expression, 0) == deserialize(Expression, "1 - 1") == Expression(0)
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