I have a python app, where I have a variable that contains multiple urls.

At this moment I use something like this:

```
for v in arr:
        cmd = 'youtube-dl -u ' + email + ' -p ' + password + ' -o "' + v['path'] + '" ' + v['url']

        os.system(cmd)

```

But this way I download just one video after another. How can I download, let's say 3 videos at the same time ? (Is not from youtube so no playlist or channels)

I not necessary need multi threading in python, but to call the youtube-dl multiple times, splitting the array. So from a python perspective can be on thread.