32位python的bug：os.system返回码一直为0
32位python在windows上调用命令行(os.system或subprocess.Popen)。执行后，如果返回码太大，python取得的返回值也是0。此时无法判断执行成功还是失败，这个是32位python的bug。
以时间同步命令w32tm位例子
在cmd上执行
C:\WINDOWS\system32>w32tm /resync 发生下列错误: 服务尚未启动。 (0x80070426) C:\WINDOWS\system32>echo %errorlevel% -2147023834
在64位python上执行
>>> os.system("w32tm /resync")
发生下列错误: 服务尚未启动。 (0x80070426)
-2147023834
在32位python上执行
>>> os.system("w32tm /resync")
发生下列错误: 服务尚未启动。 (0x80070426)
0
注意：此时命令执行错误的返回码也是0。
通常成功返回码才是0，这里执行错误，返回码却是也0。当要判断执行成功还失败时，这里便是个坑。
- os.system文档
https://docs.python.org/2/library/os.html
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