Indicator

using cAlgo.API;
using cAlgo.API.Indicators;

namespace cAlgo;

public partial class MedianPriceAverage : Indicator
{
    private SimpleMovingAverage _sma;
    private IndicatorDataSeries _medianPrices;

    protected override void Initialize()
    {
        _medianPrices = CreateDataSeries();
        _sma = Indicators.SimpleMovingAverage(_medianPrices, Periods);
    }

    public override void Calculate(int index)
    {
        _medianPrices[index] = (Bars.HighPrices[index] + Bars.LowPrices[index]) / 2;
        Result[index] = _sma.Result[index];

        if (IsLastBar)
            Print("Last value: {0}", Result[index]);
    }
}

import clr
clr.AddReference("cAlgo.API")
from cAlgo.API import *

class MedianPriceAverage():
    def initialize(self):
        self.medianPrices = api.CreateDataSeries()
        self.sma = api.Indicators.SimpleMovingAverage(self.medianPrices, api.Periods)

    def calculate(self, index):
        self.medianPrices[index] = (api.Bars.HighPrices[index] + api.Bars.LowPrices[index]) / 2
        api.Result[index] = self.sma.Result[index]
        if api.IsLastBar:
            api.Print(f"Last value: {api.Result[index]}")

{
  "AccessRights": "None",
  "IsOverlay": true,
  "Parameters": [
    {
      "Name": "Periods",
      "Type": "Integer",
      "DefaultValue": 14
    }
  ],
  "LineOutputs": [
    {
      "Name": "Result",
      "DisplayName": "Main",
      "Color": "DodgerBlue"
    }
  ]
}