code: def render_variable(env, raw, cookiecutter_dict):
      
      if raw is None:
          return None
      elif isinstance(raw, dict):
          return {
              render_variable(env, k, cookiecutter_dict):
                  render_variable(env, v, cookiecutter_dict)
              for k, v in raw.items()
          }
      elif isinstance(raw, list):
          return [
              render_variable(env, v, cookiecutter_dict)
              for v in raw
          ]
      elif not isinstance(raw, basestring):
          raw = str(raw)
  
      template = env.from_string(raw)
  
      rendered_template = template.render(cookiecutter=cookiecutter_dict)
      return rendered_template
docs: Inside the prompting taken from the cookiecutter.json file, this renders
      the next variable. For example, if a project_name is "Peanut Butter
      Cookie", the repo_name could be be rendered with:
  
          `{{ cookiecutter.project_name.replace(" ", "_") }}`.
  
      This is then presented to the user as the default.
  
      :param Environment env: A Jinja2 Environment object.
      :param str raw: The next value to be prompted for by the user.
      :param dict cookiecutter_dict: The current context as it's gradually
          being populated with variables.
      :return: The rendered value for the default variable.