def __init__(self, default_timeout = <NUM_LIT>):
dict.__init__(self)<EOL>self._timeouts = {}<EOL>self._default_timeout = default_timeout<EOL>self._lock = threading.RLock()<EOL>
Initialize an `ExpiringDictionary` object.

        :Parameters:
            - `default_timeout`: default timeout value (in seconds) for stored
              objects.
        :Types:
            - `default_timeout`: `float`