कोडिंग कार्यप्रवाह · सीमित binary64 ULP दूरी

import math, struct

def ulp_distance(a, b):
    if any(type(x) is not float or not math.isfinite(x) for x in (a, b)):
        raise ValueError("ulp.finite")
    def key(value):
        bits = struct.unpack(">Q", struct.pack(">d", value))[0]
        magnitude = bits & ((1 << 63)-1)
        return (1 << 63)-magnitude if bits >> 63 else (1 << 63)+magnitude
    return abs(key(a)-key(b))