以文件下载为例，

1. 单线程

import requests
import uuid

url_list = ['url1', 'url2']
for url in url_list:
    html = requests.get(url, stream=True)
    file_name = uuid.uuid1()
    open(f'{file_name}.json', 'wb').write(html.content)

或：

import requests
from time import time

url_list = [
    "https://via.placeholder.com/400",
    "https://via.placeholder.com/410",
    "https://via.placeholder.com/420",
    "https://via.placeholder.com/430",
    "https://via.placeholder.com/440",
    "https://via.placeholder.com/450",
    "https://via.placeholder.com/460",
    "https://via.placeholder.com/470",
    "https://via.placeholder.com/480",
    "https://via.placeholder.com/490",
    "https://via.placeholder.com/500",
    "https://via.placeholder.com/510",
    "https://via.placeholder.com/520",
    "https://via.placeholder.com/530",
]

def download_file(url):
    html = requests.get(url, stream=True)
    return html.status_code

start = time()

for url in url_list:
    print(download_file(url))

print(f'Time taken: {time() - start}')

2. 多线程

concurrent.futures — Launching parallel tasks

import requests
import uuid
from concurrent.futures import ThreadPoolExecutor, as_completed
 
url_list = ['url1', 'url2']
 
def download_file(url, file_name):
    try:
        html = requests.get(url, stream=True)
        open(f'{file_name}.json', 'wb').write(html.content)
        return html.status_code
    except requests.exceptions.RequestException as e:
       return e
 
def runner():
    threads= [] 
    with ThreadPoolExecutor(max_workers=20) as executor:
        for url in url_list:
            file_name = uuid.uuid1()
            threads.append(executor.submit(download_file, url, file_name))
            
        for task in as_completed(threads):
            print(task.result()) 
#
runner()

或，

import requests
from concurrent.futures import ThreadPoolExecutor, as_completed
from time import time

url_list = [
    "https://via.placeholder.com/400",
    "https://via.placeholder.com/410",
    "https://via.placeholder.com/420",
    "https://via.placeholder.com/430",
    "https://via.placeholder.com/440",
    "https://via.placeholder.com/450",
    "https://via.placeholder.com/460",
    "https://via.placeholder.com/470",
    "https://via.placeholder.com/480",
    "https://via.placeholder.com/490",
    "https://via.placeholder.com/500",
    "https://via.placeholder.com/510",
    "https://via.placeholder.com/520",
    "https://via.placeholder.com/530",
]

def download_file(url):
    html = requests.get(url, stream=True)
    return html.status_code

start = time()

processes = []
with ThreadPoolExecutor(max_workers=10) as executor:
    for url in url_list:
        processes.append(executor.submit(download_file, url))

for task in as_completed(processes):
    print(task.result())

print(f'Time taken: {time() - start}')