Read the bits from right to left (little-endian byte order)

[1, 1, 0, 0, 1] 2^4 + 2^3 + 2^2 + 2^1 + 2^0 2^4 + 2^3 + 0 + 0 + 2^0

In [1]:
2**4 + 2**3 + 2**0
Out[1]:
25