x, y, z = 0.5, 0.0, 0.1

vals = {c: globals()[c] for c in dir() if '__' not in c}

if sum(vals.values()) < 1:
    lowest, *other = sorted(vals, key=vals.get)
    globals()[lowest] = sum(vals[c] for c in other) / 2

print(x, y, z)