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With Django in specific you can swap out a component. For example, if (like many people) you don't like the HTML template syntax, just swap it out for Jinja2 or Mako. In Django it is also usually easy to customize something minor by use of overrides (OOP).

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This is also true of Rails. That's what the Gemfile is--a list of optional packages that you can swap out. (Almost) all of your configuration happens in that one file where you tell Rails what packages (gems) you want to use with your application.

this is very true for some of django's components. the template engine is probably the most opinionated part of django and is also one of the easiest parts to swap out. other parts of django are not so easily disposed of. for example, the ORM is very tightly integrated. its possible to swap it out for SQLAlchemy or something but this is really a huge headache and not worth doing.

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