Python使用一个进度条

由pyskydrive工程(http://code.google.com/p/pyskydrive/)中发现的进度条，加了一点修改！

import os import sys import cmd import unicodedata from threading import Thread from time import sleep class ProgressBar(Thread): """A simple text progress bar control.""" def __init__(self): self.running = True self.percent = -1 self.msg = "" Thread.__init__(self) def run(self): i = 1 while self.running and self.percent < 100: display = '/r' if self.msg != "": display += self.msg + ' ' if self.percent >= 0: display += str(self.percent) + '% ' display += '-' * (40 * self.percent / 100) if i + 1 + len(display) > 80: i = 1 display += '-' * i display += '>' display += ' ' * (80 - len(display)) sys.stderr.write(display) i += 1 sleep(0.5) sys.stderr.write('/r' + ' ' * 79 + '/r') sys.stderr.flush() def stop(self): """Stop displaying progress bar. Note: there may be latency to stop. You'd better wait for the thread stops. See _stop_progress(t_bar). """ self.running = False def set_percent(self, percent, msg = ""): """Call back method for owner of progress bar.""" self.percent = int(percent) self.msg = msg def is_alive(self): return self.isAlive() def _start_progress(): """Display a progress bar""" t_bar = ProgressBar() t_bar.start() return t_bar def _stop_progress(t_bar): """Hide the progress bar""" if hasattr(t_bar, "is_alive"): alive = t_bar.is_alive() else: alive = t_bar.isAlive() if t_bar and alive: t_bar.stop() t_bar.join() def _set_progress(t_bar,percent,msg = ""): t_bar.set_percent(percent) def _print_msg(t_bar, *args): """Hide the progress bar and print message""" assert t_bar is None or isinstance(t_bar, ProgressBar) if t_bar and t_bar.is_alive(): _stop_progress(t_bar) print ' '.join(args) def _unicode_str_width(text): """Calculate the exact width of unicode string.""" width = 0 for char in text: if isinstance(char, unicode): if unicodedata.east_asian_width(char) in ('F', 'W', 'A'): width += 2 else: width += 1 else: width += 1 return width #Test the progress bar if __name__ == "__main__": t_bar = _start_progress() count = 0; while count<100: _set_progress(t_bar,count,'%d'%(count)) sleep(0.1) count = count+1 _stop_progress(t_bar) print "Done!"

*其实几个控制函数还可以封装到一个类中使用，那就更为方便了!