Python进度条实时显示处理进度的示例代码

process_bar = ShowProcess(max_steps) # 1.在循环前定义类的实体， max_steps是总的步数  for i in range(max_steps + 1):    process_bar.show_process()   # 2.显示当前进度  time.sleep(0.05)  process_bar.close('done')      # 3.处理结束后显示消息  

#!/usr/local/lib# -*- coding: UTF-8 -*-import sys, timeclass ShowProcess():  """  显示处理进度的类  调用该类相关函数即可实现处理进度的显示  """  i = 0 # 当前的处理进度  max_steps = 0 # 总共需要处理的次数  max_arrow = 50 #进度条的长度  # 初始化函数，需要知道总共的处理次数  def __init__(self, max_steps):    self.max_steps = max_steps    self.i = 0  # 显示函数，根据当前的处理进度i显示进度  # 效果为[>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>]100.00%  def show_process(self, i=None):    if i is not None:      self.i = i    else：      self.i += 1    num_arrow = int(self.i * self.max_arrow / self.max_steps) #计算显示多少个'>'    num_line = self.max_arrow - num_arrow #计算显示多少个'-'    percent = self.i * 100.0 / self.max_steps #计算完成进度，格式为xx.xx%    process_bar = '[' + '>' * num_arrow + '-' * num_line + ']'/           + '%.2f' % percent + '%' + '/r' #带输出的字符串，'/r'表示不换行回到最左边    sys.stdout.write(process_bar) #这两句打印字符到终端    sys.stdout.flush()  def close(self, words='done'):    print ''    print words    self.i = 0if __name__=='__main__':  max_steps = 100  process_bar = ShowProcess(max_steps)  for i in range(max_steps + 1):    process_bar.show_process()    time.sleep(0.05)  process_bar.close()