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Desconozco app-engine, pero el funcionamiento de python es muy claro: self es una referencia a la instancia, self.user_post es un atributo de ella, y user_post (sin self) es una variable local. Si guardas el valor como atributo, lo podrás usar en otros métodos que usen la misma instancia. Si lo guardas con variable local, sólo tiene alcance dentro del método en el cual está declarada ...

¿Cuál es la diferencia entre declarar una variable con self '''self ...

For a language-agnostic consideration of the design decision, see What is the advantage of having this/self pointer mandatory explicit?. To close debugging questions where OP omitted a self parameter for a method and got a TypeError, use TypeError: method () takes 1 positional argument but 2 were given instead. If OP omitted self. in the body of the method and got a NameError, consider How can ...

What is the purpose of the `self` parameter? Why is it needed?

By convention, this argument is always named self. In the init method, self refers to the newly created object; in other class methods, it refers to the instance whose method was called. Python doesn't force you on using " self ". You can give it any name you want. But remember the first argument in a method definition is a reference to the object.