old_contents: import os
  from libcloud.dns.providers import DRIVERS, get_driver as get_dns_driver
  from libcloud.dns.types import Provider as DNSProvider
  
  
  def env_vars():
      env_vars = {}
      for key in os.environ:
          if key.startswith('DNS_'):
              provider = key[4:].split('_')[0].lower()
              if provider not in env_vars:
                  if provider in DRIVERS:
                      env_vars[provider.upper()] = {}
                  elif key[4:].startswith('RACKSPACE_UK'):
                      provider = 'RACKSPACE_UK'
                      env_vars['RACKSPACE_UK'] = {}
                  elif key[4:].startswith('RACKSPACE_US'):
                      provider = 'RACKSPACE_US'
                      env_vars['RACKSPACE_US'] = {}
              env_vars[provider.upper()] = os.getenv(key)
      return env_vars
  
  
  def drivers(config_map):
      return (get_dns_driver(getattr(DNSProvider, provider))
              for provider in config_map)
  
  if __name__ == '__main__':
      print(True)
  
new_contents: import os
  from libcloud.dns.providers import DRIVERS, get_driver as get_dns_driver
  from libcloud.dns.types import Provider as DNSProvider
  
  
  def env_vars():
      env_vars = {}
      for key in os.environ:
          if key.startswith('DNS_'):
              provider = key[4:].split('_')[0].lower()
              if provider not in env_vars:
                  if provider in DRIVERS:
                      env_vars[provider.upper()] = {}
                  elif key[4:].startswith('RACKSPACE_UK'):
                      provider = 'RACKSPACE_UK'
                      env_vars['RACKSPACE_UK'] = {}
                  elif key[4:].startswith('RACKSPACE_US'):
                      provider = 'RACKSPACE_US'
                      env_vars['RACKSPACE_US'] = {}
              sub_key = key[4:].split(provider.upper())[1][1:]
              env_vars[provider.upper()][sub_key] = os.getenv(key)
      return env_vars
  
  
  def drivers(config_map):
      return (get_dns_driver(getattr(DNSProvider, provider))
              for provider in config_map)
  
  if __name__ == '__main__':
      print(True)
  
subject: set k:v correctly