Multiplying boolean with float?

In arithmetic, booleans are treated as integers. True is treated as 1 and False is treated as 0.

>>> True + 1
    2
>>> False * 20
    0
>>> True * 20
    20

In python, booleans are a subclass of int:

>>> isinstance(True, int)
True

They are basically 1 and 0:

>>> True * 1
1
>>> False * 1
0

See Why is bool a subclass of int?

True is 1 and False is 0, as others have answered. So basically, what it does (and what should've been written) is:

p[i] * (pHit if hit else pMiss)

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