I am using pycharm IDE for python development it works perfectly fine for django code so suspected that converting tabs to spaces is default behaviour, however in python IDE
Open preferences, in macOS ⌘; or in Windows/Linux Ctrl + Alt + S.
Go to Editor -> Code Style -> Python, and if you want to follow PEP-8, choose Tab size: 4, Indent: 4, and Continuation indent: 8 as shown below:
Apply the changes, and click on OK.
Option 1: You can choose in the navigation bar: Edit -> Convert Indent -> To Spaces. (see image below)
Option 2: You can execute "To Spaces" action by running the Find Action shortcut: ⌘⇧A on macOS or ctrl⇧A on Windows/Linux. Then type "To Spaces", and run the action as shown in the image below.