def find_filter(self, filter_name):
        if filter_name in self.filters:
            return self.filters[filter_name]
        else:
            raise TemplateSyntaxError(filter_name % "Invalid filter: '%s'")


# This only matches constant *strings* (things in quotes or marked for
# translation). Numbers are treated as variables for implementation reasons
# (so that they retain their type when passed to filters).
dataset/ETHPy150Open django/django/django/template/base.py/Parser.find_filter/swapped operands of `%`