python 原码反码补码移码转换

以下是Python中原码、反码、补码、移码的转换方法：

1. 原码转反码：将原码符号位不变，其余各位取反即可。

def original_to_complement(original):
    if original[0] == '0':
        return original
    else:
        complement = ''
        for i in range(1, len(original)):
            complement += '0' if original[i] == '1' else '1'
        return complement

2. 反码转补码：将反码最后一位加1即可。

def complement_to_code(complement):
    code = ''
    carry = 1
    for i in range(len(complement) - 1, 0, -1):
        if complement[i] == '0' and carry == 1:
            code = '1' + code
            carry = 0
        elif complement[i] == '1' and carry == 1:
            code = '0' + code
        else:
            code = complement[i] + code
    code = complement[0] + code
    return code

3. 原码转补码：先将原码转换为反码，再将反码转换为补码即可。

def original_to_code(original):
    complement = original_to_complement(original)
    code = complement_to_code(complement)
    return code

4. 补码转移码：将补码最高位取出，其余各位不变即可。

def code_to_excess(code):
    excess = code[0]
    for i in range(1, len(code)):
        excess += '0' if code[i] == '0' else '1'
    return excess