ContextVariableMixin

class ContextVariableMixin(object):
    """
    Mixin for setting context data using class attributes.

    Example:

        class MyClass(ContextVariableMixin, View):
            prefix = "context_"
            context_bar = "foo"

        MyClass().get_context_data()["bar"] => "foo"
    """

    prefix = "context_"

    def get_context_data(self, **kwargs):
        context = super(
            ContextVariableMixin,
            self
        ).get_context_data(**kwargs)
        context.update(
            {
                var[len(self.prefix):]: getattr(self, var)
                for var in dir(self)
                if var.startswith(self.prefix)
            }
        )
        return context