def xirr_handler()

in financial_functions/lambda_handlers.py [0:0]

• 14 lines of code
• 6 McCabe index (conditional complexity)

def xirr_handler(request, context):
    """
    Returns the internal rate of return for a schedule of cash flows that is not necessarily periodic.
    :param request: Dict containing the parameters to pass to the formula.
    :param context: Lambda execution context
    :return: Dict with a 'result' entry containing the result of the calculation
    """
    logger.info("XIRR request: {}".format(request))

    validation_result = __validate_arguments('XIRR', request, schemas.xirr_schema)
    if not validation_result.get('isValid'):
        return {'error': validation_result.get('error')}
        
    # XIRR requires at least one positive and one negative value
    sorted_values = sorted(request.get('values'))
    values_length = len(request.get('values'))
    if sorted_values[0] > 0 or sorted_values[values_length - 1] <= 0:
        return {'error': "XIRR requires at least one positive and one negative value"}
        
    if len(request['values']) != len(request['dates']):
        return {'error': 'values and dates must have the same length'}

    dates = list(map(lambda s: datetime.strptime(s, '%Y-%m-%d'), request['dates']))
    args = [request['values'], dates, request.get('guess', 0.1)]
    return __call_ff('xirr', args)