Practical but does not include all of them. More on reddit.com

The primary usage I've had for sets are for collections with guaranteed uniqueness, that can just be names like strings, but can also be more complex objects like tuples or even dataclass instances. You can achieve something similar with lists and checking if the item is already in the lists, but sets are just so much easier to work with for the same result. Another use case is that it is much faster to check if an element is in a set than if it's in a list or tuple. This is not very obvious as you're starting to learn Python because for small collections (even up to a thousand or so) there isn't really a noticeable difference, but when you encounter a performance bottleneck this can be one way to improve performance. More on reddit.com

If you use "Developer: Inspect TM Scopes", it will show you what TextMate scopes apply to each token in your file. Looks like the default Python extension doesn't apply any scopes to plain variables, so you may be out of luck. However, the extension does apply scopes to variables being called, but the default Dark+ doesn't seem to use those scopes. You could try a different theme, or modify default Dark+ to colour these function calls. This could help in differentiating between variables being called in function calls and other variables, if that something you'd want. More on reddit.com

When I don't control the storage or need primitive types for any reason, I use named tuples. They're also great More on reddit.com