INNER CODE UNIT · Python

_handle_arithmetic_operator

mongomock/mongomock · mongomock/aggregate.py:351

    def _handle_arithmetic_operator(self, operator, values):
        if operator in unary_arithmetic_operators:
            try:
                number = self.parse(values)
            except KeyError:
                return None
            if number is None:
                return None
            if not isinstance(number, numbers.Number):
                raise OperationFailure(
                    f"Parameter to {operator} must evaluate to a number, got '{type(number)}'"
                )
            if operator == '$abs':
                return abs(number)
            if operator == '$ceil':
                return math.ceil(number)
            if operator == '$exp':
                return math.exp(number)

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