python爬取網頁的視頻

這裏指定了一個視頻的鏈接地址：

http://f.us.sinaimg.cn/000bIRNylx07uBalSO1y0104120cNh4r0E050.mp4?label=mp4_hd&template=640x360.28.0&Expires=1561614590&ssig=KYl0nz%2BLey&KID=unistore,video

# -*- coding: utf-8 -*-
import requests
from contextlib import closing
import time
 
def download_file(url, path):
    with closing(requests.get(url, stream=True)) as r:
        chunk_size = 1024*10
        content_size = int(r.headers['content-length'])
        print('下載開始')
        with open(path, "wb") as f:
            p = ProgressData(size = content_size, unit='Kb', block=chunk_size)
            for chunk in r.iter_content(chunk_size=chunk_size):
                f.write(chunk)
                p.output()
 
 
class ProgressData(object):
 
    def __init__(self, block,size, unit, file_name='', ):
        self.file_name = file_name
        self.block = block/1000.0
        self.size = size/1000.0
        self.unit = unit
        self.count = 0
        self.start = time.time()
    def output(self):
        self.end = time.time()
        self.count += 1
        speed = self.block/(self.end-self.start) if (self.end-self.start)>0 else 0
        self.start = time.time()
        loaded = self.count*self.block
        progress = round(loaded/self.size, 4)
        if loaded >= self.size:
            print(u'%s下載完成\r\n'%self.file_name)
        else:
            print(u'{0}下載進度{1:.2f}{2}/{3:.2f}{4} 下載速度{5:.2%} {6:.2f}{7}/s'.\
                  format(self.file_name, loaded, self.unit,\
                  self.size, self.unit, progress, speed, self.unit))
            print('%50s'%('/'*int((1-progress)*50)))

if __name__ == '__main__':
    url = "http://f.us.sinaimg.cn/000bIRNylx07uBalSO1y0104120cNh4r0E050.mp4?label=mp4_hd&template=640x360.28.0&Expires=1561614590&ssig=KYl0nz%2BLey&KID=unistore,video"
    path = "C:/Users/Kungs/Desktop/懸崖上的金魚公主.mp4"
    download_file(url, path)