分别提供了单线程下载，和异步下载

只需要在数组 urlData[ ] 中添加需要下载的链接即可

注意：批量下载的时候尽量加延迟，避免网站有反爬机制封掉ip

# -*- coding: utf-8 -*-
import requests
from tqdm import tqdm
import os
import base64
from cryptography.fernet import Fernet
import aiohttp
import asyncio
import uuid
import uvloop
from pymysql import *
try:
    import uvloop
    asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
except ImportError:
    pass



# 单线程下载
def downloadByUrl(url, downloadPath, fileName):
    # 完整路径+文件名
    dst = downloadPath + fileName
    '''同步'''
    response = requests.get(url, stream=True)
    file_size = int(response.headers['content-length'])
    if os.path.exists(dst):
        first_byte = os.path.getsize(dst)
    else:
        first_byte = 0
    if first_byte >= file_size:
        return file_size
    header = {"Range": f"bytes={first_byte}-{file_size}"}
    pbar = tqdm(
        total=file_size, initial=first_byte,
        unit='B', unit_scale=True, desc=dst)
    req = requests.get(url, headers=header, stream=True)
    with(open(dst, 'ab')) as f:
        for chunk in req.iter_content(chunk_size=1024):
            if chunk:
                f.write(chunk)
                pbar.update(1024)
    pbar.close()
    return file_size

# 异步下载
async def async_download_from_url(url, downloadPath, fileName):
    # 完整路径+文件名
    totalPath = downloadPath + fileName
    '''异步'''
    async with aiohttp.connector.TCPConnector(limit=300, force_close=True, enable_cleanup_closed=True) as tc:
        async with aiohttp.ClientSession(connector=tc) as session:
            req = await fetch(session, url, totalPath)
            file_size = int(req.headers['content-length'])
            print(f"获取视频总长度:{file_size}")
            if os.path.exists(totalPath):
                first_byte = os.path.getsize(totalPath)
            else:
                first_byte = 0
            if first_byte >= file_size:
                return file_size
            header = {"Range": f"bytes={first_byte}-{file_size}"}
            pbar = tqdm(
                total=file_size, initial=first_byte,
                unit='B', unit_scale=True, desc=totalPath)
            await fetch(session, url, totalPath, pbar=pbar, headers=header)

async def fetch(session, url, dst, pbar=None, headers=None):
    if headers:
        async with session.get(url, headers=headers) as req:
            with(open(dst, 'ab')) as f:
                while True:
                    chunk = await req.content.read(1024)
                    if not chunk:
                        break
                    f.write(chunk)
                    pbar.update(1024)
            pbar.close()
    else:
        async with session.get(url) as req:
            return req


if __name__ == '__main__':
    # 保存位置(先创建好文件夹)
    downloadPath = "/Users/renyuxin/Downloads/"
    # mp4链接列表(注意！只能是带有mp4后缀的链接才能正常下载)
    urlData = [
        "http://ryx-smart.oss-cn-beijing.aliyuncs.com/app/video/girl-video/31350AAACBA0460B81E06E8C5D40A04D.mp4",
        "http://ryx-smart.oss-cn-beijing.aliyuncs.com/app/video/girl-video/45F972192C1E4332B575DD22FB197306.mp4"
    ]

    # 方法一：单线程下载
    for item in urlData:
        fileName = f"{uuid.uuid1()}.mp4"
        downloadByUrl(urlData[0], downloadPath, fileName);

    print(" =============================================== ")

    # 方法二：多线程下载
    for index in range(len(urlData)):
        # 文件名(uuid)
        fileName = f"{uuid.uuid1()}.mp4"
        task = [asyncio.ensure_future(async_download_from_url(urlData[index], downloadPath, fileName))]
        try:
            loop = asyncio.get_event_loop()
            loop.run_until_complete(asyncio.wait(task))
        except:
            loop.run_until_complete(loop.shutdown_asyncgens())
    # 循环下载完成后关闭所有线程
    loop.close();