wrjc1hod 发表于 2024-8-18 00:18:34

【有效办公系列】循序渐进教你运用Python下载文件


    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">在<span style="color: black;">平常</span>工作和学习中，<span style="color: black;">咱们</span>经常<span style="color: black;">必须</span>从网上下载文件。Python的</span><span style="color: black;"><span style="color: black;">requests</span></span><span style="color: black;">库<span style="color: black;">便是</span>一个非常强大的工具，<span style="color: black;">能够</span><span style="color: black;">帮忙</span><span style="color: black;">咱们</span><span style="color: black;">容易</span>完成这个任务。下面，我将带你<span style="color: black;">循序渐进</span>地学会<span style="color: black;">怎样</span><span style="color: black;">运用</span></span><span style="color: black;"><span style="color: black;">requests</span></span><span style="color: black;">库来下载文件。</span></p>
    <div style="color: black; text-align: left; margin-bottom: 10px;"><img src="https://p3-sign.toutiaoimg.com/tos-cn-i-axegupay5k/2f379f0fe55e4bb489d3a17c49ff5550~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1723897113&amp;x-signature=d1gIcWxXMVRqw6rPrrbtGVax4Wc%3D" style="width: 50%; margin-bottom: 20px;"></div>
    <h1 style="color: black; text-align: left; margin-bottom: 10px;"><span style="color: black;">第1</span>步：安装requests库</h1>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">首要</span>，<span style="color: black;">保证</span>你的Python环境中<span style="color: black;">已然</span>安装了</span><span style="color: black;"><span style="color: black;">requests</span></span><span style="color: black;">库。<span style="color: black;">倘若</span>还没有安装，别担心，打开你的命令行工具（<span style="color: black;">例如</span>CMD、PowerShell<span style="color: black;">或</span>Terminal），<span style="color: black;">而后</span>输入以下命令来安装它：</span></p><span style="color: black;">pip</span> install requests<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">安装完成后，你就<span style="color: black;">能够</span><span style="color: black;">起始</span><span style="color: black;">运用</span></span><span style="color: black;"><span style="color: black;">requests</span></span><span style="color: black;">库来下载文件了。</span></p>
    <h1 style="color: black; text-align: left; margin-bottom: 10px;">第二步：编写下载函数</h1>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">接下来，<span style="color: black;">咱们</span><span style="color: black;">必须</span>编写一个函数来下载文件。这个函数会接收两个参数：文件的URL和你<span style="color: black;">期盼</span><span style="color: black;">保留</span>的文件名。</span></p><span style="color: black;">import</span> requests

    <span style="color: black;"><span style="color: black;">def</span> <span style="color: black;">download_file</span><span style="color: black;">(url, save_as)</span>:</span>
    <span style="color: black;">"""
      从指定的URL下载文件，并<span style="color: black;">保留</span>到本地。

      参数:
      url (str): 文件的网络<span style="color: black;">位置</span>。
      save_as (str): 本地<span style="color: black;">保留</span>的文件名和路径。
      """</span>
    <span style="color: black;"># 发送GET请求，并设置stream=True以分块读取文件</span>
    response = requests.get(url, stream=<span style="color: black;">True</span>)

    <span style="color: black;"># <span style="color: black;">保证</span>请求成功</span>
    response.raise_for_status()

    <span style="color: black;"># 打开本地文件，准备写入</span>
    <span style="color: black;">with</span> open(save_as, <span style="color: black;">wb</span>) <span style="color: black;">as</span> file:
    <span style="color: black;"># 逐块读取内容并写入文件</span>
    <span style="color: black;">for</span> chunk <span style="color: black;">in</span> response.iter_content(chunk_size=<span style="color: black;">8192</span>):
    <span style="color: black;">if</span> chunk: <span style="color: black;"># <span style="color: black;">倘若</span>chunk不为空，则写入文件</span>
    file.write(chunk)

    print(<span style="color: black;">f"文件已成功<span style="color: black;">保留</span>到：<span style="color: black;">{save_as}</span>"</span>)<h1 style="color: black; text-align: left; margin-bottom: 10px;">第三步：<span style="color: black;">运用</span>函数下载文件</h1>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">此刻</span>，你<span style="color: black;">已然</span>有了一个<span style="color: black;">能够</span>下载文件的函数。接下来，你只<span style="color: black;">必须</span>调用这个函数，并传入文件的URL和你想要<span style="color: black;">保留</span>的文件名<span style="color: black;">就可</span>。</span></p><span style="color: black;"># 示例用法</span>
    <span style="color: black;">file_url</span> = <span style="color: black;">http://example.com/somefile.zip</span> <span style="color: black;"># <span style="color: black;">这儿</span>替换成你想要下载的文件的URL</span>
    save_path = <span style="color: black;">下载的文件.zip</span> <span style="color: black;"># 你<span style="color: black;">能够</span>修改这个文件名和路径，以适应你的需求</span>

    <span style="color: black;"># 调用函数下载文件</span>
    download_file(file_url, save_path)<h1 style="color: black; text-align: left; margin-bottom: 10px;"><span style="color: black;">重视</span>事项</h1><span style="color: black;"><span style="color: black;">保证</span>你有权限从指定的URL下载文件。</span><span style="color: black;"><span style="color: black;">倘若</span>下载的是大文件，</span><span style="color: black;"><span style="color: black;">stream=True</span></span><span style="color: black;">参数会<span style="color: black;">帮忙</span>你逐块读取文件内容，避免内存溢出。</span><span style="color: black;"><span style="color: black;">倘若</span>你<span style="color: black;">必须</span>下载的文件<span style="color: black;">必须</span>登录<span style="color: black;">才可</span><span style="color: black;">拜访</span>，你可能<span style="color: black;">必须</span>在</span><span style="color: black;"><span style="color: black;">requests.get()</span></span><span style="color: black;">函数中设置相应的认证信息（如cookies或headers）。</span>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">经过</span>以上<span style="color: black;">过程</span>，你应该能够<span style="color: black;">容易</span>地<span style="color: black;">运用</span>Python和</span><span style="color: black;"><span style="color: black;">requests</span></span><span style="color: black;">库来下载文件了。<span style="color: black;">期盼</span>这个教程对你有所<span style="color: black;">帮忙</span>！</span></p>




不锈钢厂家 发表于 2024-9-10 00:57:27

这篇文章真的让我受益匪浅，外链发布感谢分享！

nqkk58 发表于 2024-10-20 15:09:15

感谢楼主的分享！我学到了很多。

wrjc1hod 发表于 2024-11-1 09:15:34

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