Help with assignment

[dxfrelince]

Hi,

I want to make a nested indexing on heatingdata = [m,t1,t2,s].

When i Write: heatingdata = [m,t1,t2,s]
i=0
For i in range (list(heatingdata)):
  print(i)

it's says name 'm' is not defined. But the teacher has not defined the different letters for us, so how can I make a list on this?

Thanks