python添加Windows环境变量

1.cmd中添加方式

SET PATH=%PATH%;c:Program Files (x86)Wireshark

注：如上代码添加c:Program Files (x86)Wireshark至Windows环境变量中

但在python中使用os.system()函数却无法执行该命令，目前还未找到原因。

2.python操作Windows注册表进行更改

import _winreg as wg
key_test = wg.OpenKey(wg.HKEY_LOCAL_MACHINE,r"SYSTEMCurrentControlSetControlSession ManagerEnvironment",0,wg.KEY_ALL_ACCESS)
path_str = wg.QueryValueEx(key_test,'path')
path_str_new = path_str[0] + ';' + 'c:Program Files (x86)Wireshark'
wg.SetValueEx(key_test,'path','',path_str[1],path_str_new)
wg.FlushKey(key_test)
wg.CloseKey(key_test)

注：path_str的值为(u'C:\Python27\;C:\Python27\Scripts;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%systemroot%\System32\WindowsPowerShell\v1.0\;%systemroot%\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;;"C:\Program Files (x86)\Spirent Communications\Spirent TestCenter 4.68\Layer 4-7 Application";C:\Program Files\TortoiseSVN\bin;C:\Python27;c:\Program Files (x86)\Wireshark', 2)