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Assuming you mean frontend web development.

It depends on the type of project, but I'd recommend following a REST server-client architecture whenever possible, which makes separating the client from the data logic easier.

With that in mind, then the difference depends on the type of application:

• If it's an SPA, then the client could be any of the JS frameworks (or just vanilla js is it's not too complex), it'd consume the REST API written in python.
• If it isn't, then the client could be written in python itself, with any of the templating languages available. Jinja is the one I use most often.

Sometimes, the type of application allows for enough logic to live on the REST API to make the decision one of what templates to use JS or Python.