python下载速度显示_Python获取下载速度并显示进度条

#!/usr/bin/python3

# -*- coding:utf-8 -*-

import sys

import time

from urllib import request

‘‘‘

urllib.urlretrieve 的回调函数：

def callbackfunc(blocknum, blocksize, totalsize):

@blocknum: 已经下载的数据块

@blocksize: 数据块的大小

@totalsize: 远程文件的大小

‘‘‘

def Schedule(blocknum, blocksize, totalsize):

speed = (blocknum * blocksize) / (time.time() - start_time)

# speed_str = " Speed: %.2f" % speed

speed_str = " Speed: %s" % format_size(speed)

recv_size = blocknum * blocksize

# 设置下载进度条

f = sys.stdout

pervent = recv_size / totalsize

percent_str = "%.2f%%" % (pervent * 100)

n = round(pervent * 50)

s = (‘#‘ * n).ljust(50, ‘-‘)

f.write(percent_str.ljust(8, ‘ ‘) + ‘[‘ + s + ‘]‘ + speed_str)

f.flush()

# time.sleep(0.1)

f.write(‘\r‘)

# 字节bytes转化K\M\G

def format_size(bytes):

try:

bytes = float(bytes)

kb = bytes / 1024

except:

print("传入的字节格式不对")

return "Error"

if kb >= 1024:

M = kb / 1024

if M >= 1024:

G = M / 1024

return "%.3fG" % (G)

else:

return "%.3fM" % (M)

else:

return "%.3fK" % (kb)

if __name__ == ‘__main__‘:

# print(format_size(1222222222))

start_time = time.time()

filename = ‘test.data‘

url = ‘http://ip:port/path/speed.test‘

request.urlretrieve(url, filename, Schedule)

原文：http://www.cnblogs.com/standby/p/7384187.html