code: def get(self, key):
          
          skey  = self.marshall_key(key)
          data  = self.__db[skey]
          crash = self.unmarshall_value(data)
          return crash
docs: Retrieves a crash from the container.
  
          @type  key: L{Crash} unique key.
          @param key: Key of the crash to get.
  
          @rtype:  L{Crash} object.
          @return: Crash matching the given key.
  
          @see:     L{iterkeys}
          @warning: A B{copy} of each object is returned,
              so any changes made to them will be lost.
  
              To preserve changes do the following:
                  1. Keep a reference to the object.
                  2. Delete the object from the set.
                  3. Modify the object and add it again.