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@Targoyle(たーごいる)

Pythonの2の補数変換

Posted at

文字列に変換したくなかったので以下

def tc(x, bits):
    if x > bits>>1:
        x = ~(x ^ bits)
    return x

ex. 4ビット

>>> tc(7, 0xF)
7
>>> tc(8, 0xF)
-8
>>> tc(0xF, 0xF)
-1

ex. 16ビット

>>> tc(32768, 0xFFFF)
-32768
>>> tc(32767, 0xFFFF)
32767
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