How to run a DOS batch file in background using Python?

I have a test.bat file in say C:\  

Now, I want to run this bat file using python in the background and then I want to return to the python command line. 

I run the batch file using `subprocess.call('path\to\test.bat')` from the python command line.
It runs the batch file in the same window as the python command line. 

If still not clear/ TL.DR-

What is happening:

```
>>>subprocess.call('C:\test.bat')
(Running test.bat. Can't use python in the same window)

```

What I want:

```
>>>subprocess.call('C:\test.bat')
(New commandline window created in the background where test.bat runs in parallel.)
>>>

```