Python binary number 1

Use py to count the number of binary 1

Implemented for example as follows :( tanimoto similarity function)

def  getOneNum(bits):
    countOne = 0
    while bits:
        countOne = countOne+1
        bits = bits&(bits-1)
    return float(countOne)
    

def tanimoto(X, Y):
    XYbits = X&Y
    return getOneNum(XYbits)/(getOneNum(X)+getOneNum(Y)-getOneNum(XYbits))

print(tanimoto(0b011010,0b100111))

Further information about using non-binary data to calculate the similarity matrix tanimoto the like, may refer to:

https://e3fp.readthedocs.io/en/latest/_modules/e3fp/fingerprint/metrics.html#tanimoto

https://github.com/keiserlab/e3fp/blob/1.1/e3fp/fingerprint/metrics/array_metrics.py