try-except & Boolean

Question

a = [4, 5, 6, 7]
try:
print(a[True])
except:
print(a[0])

here is my question:

[List a] has no elements associated with True.

So, it won't trigger the condition of try.

Only the condition of except will be triggered.

All i know is [List a]'s first element is 4, so a[0] = 4

Why this code's output is 5 ?

Answer 1

Good question Friday ,
~ swim ~ has answered the question perfectly

Answer 2

For this reason:
0 is False
1 is True

So "a[True]" is "a[1]"