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This loads the variables and attributes simultaneously. A centralized loading function makes it easier to create data stores that do automatic encoding/decoding.

For example:

class SuffixAppendingDataStore(AbstractDataStore):

    def load(self):
        variables, attributes = AbstractDataStore.load(self)
        variables = {'%s_suffix' % k: v
                     for k, v in variables.items()}
        attributes = {'%s_suffix' % k: v
                      for k, v in attributes.items()}
        return variables, attributes

This function will be called anytime variables or attributes are requested, so care should be taken to make sure its fast.