def METHOD_NAME(self):
    """Read in the data from the cache"""
    # Merge the existing data with items from the cache, favor cache items
    self.data = dict(list(self.data.items()) + list(get_cache(self.key).items()))
    # set some member variables
    if self.data['progress_key']:
        self.key = self.data['progress_key']
    if self.data['total']:
        self.total = self.data['total']