如何使用Python尽可能高效地下载和上传文件？

import urllib.request

url = 'http://example.com/file.txt'
save_path = 'path/to/save/file.txt'

urllib.request.urlretrieve(url, save_path)

import requests

url = 'http://example.com/upload'
file_path = 'path/to/file.txt'

files = {'file': open(file_path, 'rb')}
response = requests.post(url, files=files)

import urllib.request
from tqdm import tqdm

url = 'http://example.com/file.txt'
save_path = 'path/to/save/file.txt'

response = urllib.request.urlopen(url)
file_size = int(response.headers['Content-Length'])
block_size = 1024
num_blocks = file_size // block_size

with tqdm(total=num_blocks, unit='KB') as pbar:
    with open(save_path, 'wb') as file:
        while True:
            buffer = response.read(block_size)
            if not buffer:
                break
            file.write(buffer)
            pbar.update(1)