#!/usr/bin/python# -*- coding: utf-8 -*-import ftplibimport osimport sockethost = 'ftp.mozilla.org'dirn = 'pub/mozilla.org/webtools'file = 'bugzilla-3.6.9-to-3.6.10-nodocs.diff.gz'def writedata(data): f = open(file,'wb') try: f.write(data) finally: f.close()def main(): try: f = ftplib.ftp(host) except (socket.error, socket.gaierror): print 'error:cannot reach %s' % host return print '***connected to host %s' % host try: f.login() except ftplib.error_perm: print 'error: cannot login anonymously' f.quit() return print '*** logged in as anonymously' try: f.cwd(dirn) except ftplib.error_perm: print 'errorl cannot cd to %s' % dirn f.quit() return print '*** changed to %s folder' % dirn try: #传一个回调函数给retrbinary() 它在每接收一个二进制数据时都会被调用 f.retrbinary('retr %s' %file, writedata) except ftplib.error_perm: print 'error: cannot read file %s' %file os.unlink(file) else: print '*** downloaded %s to cwd' % file f.quit() returnif __name__ == '__main__': main()
希望本文所述对大家的python程序设计有所帮助。