python 实现命令行的进度条，python进度条,如下代码片段：class

python 实现命令行的进度条，python进度条,如下代码片段：class

如下代码片段：

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)+\                "|\n %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)

只在linux下可用，在windows下会提示没有clear命令