今天想尝试怎么运用python进入sql server 的单用户模式，我尝试的语句如下：
subprocess.call('sqlservr.exe -c -f -m')
在命令提示符中运行，结果
报错如下：
Traceback (most recent call last):
File "test.py", line 6, in <module>
subprocess.call('sqlservr.exe -c -f -m')
File "C:\Python27\lib\subprocess.py", line 172, in call
return Popen(*popenargs, **kwargs).wait()
File "C:\Python27\lib\subprocess.py", line 394, in init
errread, errwrite)
File "C:\Python27\lib\subprocess.py", line 644, in _execute_child
startupinfo)
WindowsError: [Error 2] The system cannot find the file specified
求：大神指教！