def to_nullable_double()

in azure_functions_worker/bindings/nullable_converters.py [0:0]

• 20 lines of code
• 7 McCabe index (conditional complexity)

def to_nullable_double(nullable: Optional[Union[str, int, float]],
                       property_name: str) -> \
        Optional[protos.NullableDouble]:
    """Converts int or float or str that parses to a number to an
    'NullableDouble' to be sent through the RPC layer. Input that is not a
    valid number but is also not null or undefined logs a function app level
    warning.
    :param nullable Input to be converted to an NullableDouble if it is a
    valid number
    :param property_name The name of the property that the caller will
    assign the output to. Used for debugging.
    """
    if isinstance(nullable, int) or isinstance(nullable, float):
        return protos.NullableDouble(value=nullable)
    elif isinstance(nullable, str):
        if len(nullable) == 0:
            return None

        try:
            return protos.NullableDouble(value=float(nullable))
        except Exception:
            raise TypeError(
                f"Cannot parse value {nullable} of '{property_name}' to "
                f"float.")

    if nullable is not None:
        raise TypeError(
            f"A 'int' or 'float'"
            f" type was expected instead of a '{type(nullable)}' "
            f"type. Cannot parse value {nullable} of '{property_name}'.")

    return None