<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def SampleStart(self):
 """Starts measuring the CPU time."""

    self._start_cpu_time = time.clock()
    self.start_sample_time = time.time()
    self.total_cpu_time = 0