Coin Toss - Distribution

[lasek723]

Negative indexing reads value from backwards. For instance

>>> a = [1, 2, 3]
>>> a[-1]
3
>>> a[-2]
2
>>> a[0]
1
>>> a[1]
2

I hope that give some explanation of the behaviour

I understand the negative indexing part using a list. I'm trying to understand how it works on the coin toss example

If you threw tails 4 times .... wouldn't -4 + 0 (from tails = [0} ........ come to -4?

Apologies for not understanding .... I'm a newbie :-)