Python实现带百分比的进度条

大家在安装程序或下载文件时，通常都能看到进度条，提示你当前任务的进度。其实，在python中实现这个功能很简单，下面是具体代码。在实际应用中，你完全可以根据自己的要求进行修改！比如，示例中是通过time.sleep()方法进行时间延迟，你完全可以根据实际的程序运行耗时进行控制；同样，在进度百分比处，你也可以显示实际的进度比，而不是例子中机械的自增百分比。

    import sys
    import time

    def view_bar(num, total):
      rate = num / total
      rate_num = int(rate * 100)
      r = '\r[%s%s]%d%%' % ("="*num, " "*(100-num), rate_num, )
      sys.stdout.write(r)
      sys.stdout.flush()

    if __name__ == '__main__':
      for i in range(0, 101):
        time.sleep(0.1)
        view_bar(i, 100)

再给大家分享一个方法

    import hashlib

    a = "a test string"
    print hashlib.md5(a).hexdigest()
    print hashlib.sha1(a).hexdigest()
    print hashlib.sha224(a).hexdigest()
    print hashlib.sha256(a).hexdigest()
    print hashlib.sha384(a).hexdigest()
    print hashlib.sha512(a).hexdigest()

再来一个复杂点的函数吧

    #!/usr/bin/env python
    #-*- coding:utf-8 -*-
    import threading
    import time
    '''
    class Demo:
      def __init__(self,thread_num=5):
        self.thread_num=thread_num
      def productor(self,i):
        print "thread-%d start" %i
      def start(self):
        threads=[]
        for x in xrange(self.thread_num):
          t=threading.Thread(target=self.productor,args=(x,))
          threads.append(t)
        for t in threads:
          t.start()
        for t in threads:
          t.join()
        print 'all thread end'

    demo=Demo()
    demo.start()
    '''
    thread_num=10
    def productor(i):
        print "thread-%d start" %i
        time.sleep(2)
    def start():
        threads=[]
        for x in range(thread_num):
          t=threading.Thread(target=productor,args=(x,))
          threads.append(t)
        for t in threads:
          t.start()
        for t in threads:
          t.join()
        print 'all thread end'

    start()

    #!/usr/bin/env python
    #-*- coding:utf-8 -*-
    import paramiko
    import sys

    private_key = paramiko.RSAKey.from_private_key_file('/root/.ssh/id_rsa')
    # 创建SSH对象
    ssh = paramiko.SSHClient()
    # 允许连接不在know_hosts文件中的主机
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    t = paramiko.Transport(('vm_135',22))
    # 连接服务器
    t.connect(username='root',pkey=private_key)
    ssh.connect(hostname='vm_135', port=22, username='root',pkey=private_key)
    # 执行命令
    sftp = paramiko.SFTPClient.from_transport(t)
    stdin, stdout, stderr = ssh.exec_command('df')
    # 获取命令结果
    result = stdout.read()
    print result

    def progress_bar(transferred, toBeTransferred, suffix=''):
        # print "Transferred: {0}\tOut of: {1}".format(transferred, toBeTransferred)
        bar_len = 60
        filled_len = int(round(bar_len * transferred/float(toBeTransferred)))
        percents = round(100.0 * transferred/float(toBeTransferred), 1)
        bar = '=' * filled_len + '-' * (bar_len - filled_len)
        sys.stdout.write('[%s] %s%s ...%s\r' % (bar, percents, '%', suffix))
        sys.stdout.flush()
    sftp.put("/tmp/134","/tmp/134",callback=progress_bar)

    #for filename in filenames:
    #  sftp.put(os.path.join(dirpath, filename),
    #       os.path.join(remote_path, filename),
    #       callback=self.progress_bar)
    #  print
    #  print "upload %s/%s" % (remote_path, filename) + '\t' + '[' + green("success") + ']'
    ssh.close()

以上就是本文的全部内容了，大家是否对使用Python实现带百分比进度条有了新的认识了呢，希望大家能够喜欢。