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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get(security_token=None, key=None):
 """ Get information about this node """

    if security_token is None:
        security_token = nago.core.get_my_info()['host_name']
    data = node_data.get(security_token, {})
    if not key:
        return data
    else:
        return data.get(key)