<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def load_constants(self):
 """Load all constants into their respective streams. All previous calls to add_constant stored a constant value that should be associated with virtual stream walkers. This function actually calls push_stream in order to push all of the constant values to their walkers. """


        for stream, value in self.constant_database.items():
            self.sensor_log.push(stream, IOTileReading(0, stream.encode(), value))