def __init__(self, keys=None):
    if not keys:
      raise errors.FormatError(u'Missing keys value.')

    if not isinstance(keys, list):
      raise errors.FormatError(u'keys must be a list')

    for key in keys:
      self.ValidateKey(key)

    super(WindowsRegistryKeySourceType, self).__init__()
    self.keys = keys
Iterate through all the users and do stuff.
dataset/ETHPy150Open ForensicArtifacts/artifacts/artifacts/source_type.py/WindowsRegistryKeySourceType.__init__--crossover with--dataset/ETHPy150Open tomwilkie/awesomation/src/appengine/tasks.py/update