old_contents: import time
  class timing:
     def __init__(self,info):
        self.info=info
        self.t0=time.clock()
        self.w0=time.time()
        self.t1=None
        self.w1=None
     def __str__(self):
        if self.t1 is None: self.stop()
        t=self.t1-self.t0
        w=self.w1-self.w0
        return "Time used in %-20s:%10.2f (cpu) %10.2f (wall)"""%(self.info,t,w)
     def stop(self):
        self.t1=time.clock()
        self.w1=time.time()
  
  if __name__ == "__main__":
     import os
     if 1:
        timeme=timing("test")
        os.system("sleep 3")
        print timeme
  
new_contents: import time
  class timing:
     def __init__(self,info):
        self.info=info
        self.t0=time.clock()
        self.w0=time.time()
        self.t1=None
        self.w1=None
     def __str__(self):
        if self.t1 is None: self.stop()
        t=self.t1-self.t0
        w=self.w1-self.w0
        return "Time used in %-20s:%10.2f (cpu) %10.2f (wall)"""%(self.info,t,w)
     def stop(self):
        self.t1=time.clock()
        self.w1=time.time()
  
subject: remove obsolete timing.__main__