old_contents: from app import mulungwishi_app as url
  from flask import render_template
  
  
  @url.route('/')
  def index():
      return render_template('index.html')
  
  
  @url.route('/<query>')
  def print_user_input(query):
      if '=' in query:
          query_container, query_value = query.split('=')
          return 'Your query is {} which is equal to {}'.format(query_container, query_value)
      return "You've entered an incorrect query. Please check and try again. Input : "+query
  
  
  @url.errorhandler(404)
  def page_not_found(error):
      return render_template('404.html'), 404
  
  
  @url.errorhandler(403)
  def page_forbidden(error):
      return render_template('403.html', title='Page Forbidden'), 403
  
  
  @url.errorhandler(500)
  def page_server_error(error):
      return render_template('500.html', title='Server Error'), 500
  
new_contents: from app import mulungwishi_app as url
  from flask import render_template
  
  
  @url.route('/')
  def index():
      return render_template('index.html')
  
  
  @url.route('/<query>')
  def print_user_input(query):
      if '=' in query:
          query_container, query_value = query.split('=')
          return 'Your query is {} which is equal to {}'.format(query_container, query_value)
      return "You've entered an incorrect query. Please check and try again. Input : {}".format(query)
  
  
  @url.errorhandler(404)
  def page_not_found(error):
      return render_template('404.html'), 404
  
  
  @url.errorhandler(403)
  def page_forbidden(error):
      return render_template('403.html', title='Page Forbidden'), 403
  
  
  @url.errorhandler(500)
  def page_server_error(error):
      return render_template('500.html', title='Server Error'), 500
  
subject: Replace string concatenation with .format function