text: # -*- coding: UTF-8 -*-
  """
  All the things can override via Environment variables are keep in this one file.
  """
  from os import environ
  from collections import namedtuple, OrderedDict
  
  
  DEFINED = OrderedDict([
              ('LINK_LOG_LEVEL', environ.get('LINK_LOG_LEVEL', 'INFO')),
              ('LINK_MAX_COUNT', int(environ.get('LINK_MAX_COUNT', 1000))),
              ('VLAB_URL', environ.get('VLAB_URL', 'https://localhost')),
              ('VLAB_VERIFY_TOKEN', environ.get('VLAB_VERIFY_TOKEN', False)),
            ])
  
  Constants = namedtuple('Constants', list(DEFINED.keys()))
  
  # The '*' expands the list, just liked passing a function *args
  const = Constants(*list(DEFINED.values()))
  