Evaluate Operator

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from dataclasses import dataclass

@dataclass
class Expression:
    pass

@dataclass
class BinaryExpression(Expression):
    operator: str
    left: Expression
    right: Expression
    
@dataclass
class IntegerExpression(Expression):
    value: int

###### Edit below #################################################################
    
def evaluate_math(expression: Expression) -> int:
    if isinstance(expression, IntegerExpression):
        # In this base case, you *know* that expression is an IntegerExpression!
        return ___
    # In this recursive case, you *know* that expression is a BinaryExpression!
    # ...
    # ... Replace these comments with the real code!
    # ...
    return ___