python在控制台输出进度条的方法

|#############################---------------------|
59 percent done

class ProgressBar():
 def __init__(self, width=50):
 self.pointer = 0
 self.width = width
 def __call__(self,x):
 # x in percent
 self.pointer = int(self.width*(x/100.0))
 return "|" + "#"*self.pointer + "-"*(self.width-self.pointer)+
 "|
 %d percent done" % int(x)

if __name__ == '__main__':
 import time, os
 pb = ProgressBar()
 for i in range(101):
 os.system('clear')
 print pb(i)
 time.sleep(0.1)