entityCreator.py

def hashCode(s):
    """Computes the java `hashCode()` of a str
    
    s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1], where n is len(s)
    """
    TWO_31 = 2147483648
    TWO_32 = 4294967296

    l = len(s)
    code = 0
    for i, c in enumerate(s):
        code += ord(c) * (31**(l-1-i))
        
    # convert to 32 bit integer
    return (code + TWO_31) % TWO_32 - TWO_31