Python下载文件的10种方法介绍_Python

在python中，我们可以使用多种方法来实现文件下载功能。本文将介绍10种不同的python文件下载方式，并提供详细的代码示例。

1. 使用urllib.request模块

import urllib.request

url = 'https://example.com/file.zip'
filename = 'file.zip'

urllib.request.urlretrieve(url, filename)
print(f"文件已下载到: {filename}")

2. 使用requests库（简单方式）

import requests

url = 'https://example.com/file.zip'
filename = 'file.zip'

response = requests.get(url)
with open(filename, 'wb') as f:
    f.write(response.content)
print("下载完成!")

3. 使用requests库（带进度条）

import requests
from tqdm import tqdm

url = 'https://example.com/largefile.zip'
filename = 'largefile.zip'

response = requests.get(url, stream=true)
total_size = int(response.headers.get('content-length', 0))
block_size = 1024  # 1kb

progress_bar = tqdm(total=total_size, unit='ib', unit_scale=true)
with open(filename, 'wb') as f:
    for data in response.iter_content(block_size):
        progress_bar.update(len(data))
        f.write(data)
progress_bar.close()
print("\n下载完成!")

4. 使用wget库

import wget

url = 'https://example.com/file.zip'
filename = wget.download(url)
print(f"\n文件已下载到: {filename}")

5. 使用http.client（标准库）

import http.client
import urllib.parse

url = 'https://example.com/file.zip'
parsed_url = urllib.parse.urlparse(url)
filename = 'file.zip'

conn = http.client.httpsconnection(parsed_url.netloc)
conn.request("get", parsed_url.path)
response = conn.getresponse()

with open(filename, 'wb') as f:
    f.write(response.read())
conn.close()
print("下载完成!")

6. 使用aiohttp（异步下载）

import aiohttp
import asyncio

async def download_file(url, filename):
    async with aiohttp.clientsession() as session:
        async with session.get(url) as response:
            with open(filename, 'wb') as f:
                while true:
                    chunk = await response.content.read(1024)
                    if not chunk:
                        break
                    f.write(chunk)
    print(f"文件已下载到: {filename}")

url = 'https://example.com/file.zip'
filename = 'file.zip'

asyncio.run(download_file(url, filename))

7. 使用pycurl（高性能下载）

import pycurl
from io import bytesio

url = 'https://example.com/file.zip'
filename = 'file.zip'

buffer = bytesio()
c = pycurl.curl()
c.setopt(c.url, url)
c.setopt(c.writedata, buffer)
c.perform()
c.close()

with open(filename, 'wb') as f:
    f.write(buffer.getvalue())
print("下载完成!")

8. 使用urllib3库

import urllib3

url = 'https://example.com/file.zip'
filename = 'file.zip'

http = urllib3.poolmanager()
response = http.request('get', url)

with open(filename, 'wb') as f:
    f.write(response.data)
print("下载完成!")

9. 使用ftplib下载ftp文件

from ftplib import ftp

ftp = ftp('ftp.example.com')
ftp.login(user='username', passwd='password')
filename = 'remote_file.zip'
local_filename = 'local_file.zip'

with open(local_filename, 'wb') as f:
    ftp.retrbinary(f'retr {filename}', f.write)
ftp.quit()
print("ftp文件下载完成!")

10. 使用scp下载（通过paramiko）

import paramiko

host = 'example.com'
port = 22
username = 'user'
password = 'password'
remote_path = '/path/to/remote/file.zip'
local_path = 'file.zip'

ssh = paramiko.sshclient()
ssh.set_missing_host_key_policy(paramiko.autoaddpolicy())
ssh.connect(host, port, username, password)

sftp = ssh.open_sftp()
sftp.get(remote_path, local_path)
sftp.close()
ssh.close()
print("scp文件下载完成!")