def set_arg(self, value):
        named_arg = '{0}A{1}'.format(self.arg_prefix, self.arg_index)
        self.args[named_arg] = value
        self.arg_index += 1
        return named_arg
Set the query param in self.args based on the prefix and arg index
dataset/ETHPy150Open ambitioninc/django-query-builder/querybuilder/query.py/Where.set_arg