#!/usr/bin/env python  #-*-coding:utf-8-*-'  #Filename:download_file.py    import sys,os  import urllib    def urlcallback(a,b,c):      """          call back function          a,已下载的数据块          b,数据块的大小          c,远程文件的大小      """      print "callback"      prec=100.0*a*b/c      if 100 < prec:          prec=100      print "%.2f%%"%(prec,)    def main(argv):      """          main      """      print "start..."      urllib.urlretrieve("<a href="http://jaist.dl.sourceforge.net/project/pydev/pydev/Pydev%201.6.3/org.python.pydev.feature-1.6.3.2010100513.zip">http://jaist.dl.sourceforge.net/project/pydev/pydev/Pydev%201.6.3/org.python.pydev.feature-1.6.3.2010100513.zip"\\                        ,"/tmp/python.pydev.zip"\\                        ,urlcallback)      print "end..."    if __name__=="__main__":      main(sys.argv[1:])