code: def random_label():
      chars = string.ascii_letters + string.digits + " àéèçêâäëï"
      return "".join(
          [random.choice(chars) for i in range(random.randrange(4, 30))]
      )
  
file_path: pygal/demo/moulinrouge/__init__.py
imports: import pickle
  import random
  import string
  from base64 import urlsafe_b64decode
  from base64 import urlsafe_b64encode
  from flask import Flask, Response, render_template, request
  import pygal
  from pygal.config import Config
  from pygal.etree import etree
  from pygal.style import parametric_styles, styles
  from pygal.util import cut
label_desc: Use image node_id 2 for calling a global function with example usage: random_label() and returns: str