old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  from paste.script.templates import NoDefault, Template, var
  from jinja2 import Template as Jinja2Template
  
  
  class Boilerplate(Template):
      _template_dir = 'templates'
      summary = 'A boilerplate for Flask project'
      required_templates = []
      vars = [
          var('app_name', 'Flask application name', default=NoDefault),
          var('description', 'One-line description of the package'),
          var('author', 'Author name'),
          var('author_email', 'Author email'),
      ]
      @staticmethod
      def template_renderer(context, _vars, filename=None):
          # If you want to use Template in Paste, please use paste.util.template.paste_script_template_renderer
          return Jinja2Template(context).render(_vars)
  
      def check_vars(self, vars, command):
          return Template.check_vars(self, vars, command)
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  from paste.script.templates import NoDefault, Template, var
  from jinja2 import Template as Jinja2Template
  
  
  class Boilerplate(Template):
      _template_dir = 'templates'
      summary = 'A boilerplate for Flask project'
      required_templates = []
      vars = [
          var('app_name', 'Flask application name', default=NoDefault),
          var('description', 'One-line description of the package'),
          var('author', 'Author name'),
          var('author_email', 'Author email'),
      ]
      @staticmethod
      def template_renderer(body, context, filename=None):
          # If you want to use Template in Paste, please use paste.util.template.paste_script_template_renderer
          return Jinja2Template(body).render(context)
  
      def check_vars(self, user_vars, command):
          return Template.check_vars(self, user_vars, command)
  
subject: Refactor argument name.