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。