How to access index beyond [-2]?

[CadeHalcyon]

Hi, how do we access info from Data more then [-2] back, please? See below simple example for illustrative purposes:

`def next(self):

      price = self.data.Close[-1]
      Signal = self.Signal[-1]
      Pre_Signal_1 = self.Signal[-2]
      Pre_Signal_2 = self.Signal[-3]`

When I try this, I get the following error regarding Pre_Signal_2:

IndexError: index -3 is out of bounds for axis 0 with size 2

[kernc]

You can simply wrap it all in:

max_lookback = 3
if len(self.Signal) > max_lookback:
    ...

[CadeHalcyon]

Thanks! Your answer also helped me understand why I was getting the error too (I'm relatively new to coding).