How do i automatically update URL each time when a user entered a new url

[bigsandip]

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Question

Iam building a simple video downloader from any website in django. Whenever a user entered a url in a url field i capture it in views.py by URL_LIST = form.cleaned_data['url'] .Now i want to automatically update url in this line ("youtube-dl -f best --output ~/Downloads/%(title)s.%(ext)s -ik --format mp4 --yes-playlist **URL_LIST** ") .I know another way is to write the user entered url to a .txt file and read from it like os.system("youtube-dl -f best --output ~/Downloads/%(title)s.%(ext)s -ik --format mp4 --yes-playlist -a list.txt ") but some reason the server didnt give read/write permission to list.txt file in production.

[dstftw]

Use python string formatting obviously.