从互联网上下载文件python代码

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import requests
import traceback
import os

def download_file(url, filename):
    """将链接中的数据存储入文件中。

    Args:
        url: 链接。
        filename: 文件路径名。
    Raises:
        KeyboardInterrupt: 用户按^C引发异常。
        Exception: 发生异常。
    """
    if os.path.exists(filename):
        print('file '+filename+' exists!')
        return
    try:
        r = requests.get(url, stream=True, timeout=60)
        r.raise_for_status() # 建立连接
        with open(filename, 'wb') as f:
            for chunk in r.iter_content(chunk_size=1024): # 分块写入二进制内容
                if chunk:
                    f.write(chunk)
                    f.flush()
        print('downloading '+filename+' successfully!')
        return filename
    except KeyboardInterrupt:
        if os.path.exists(filename):
            os.remove(filename)
        raise KeyboardInterrupt
    except Exception:
        traceback.print_exc()
        if os.path.exists(filename):
            os.remove(filename)

创建于2412251740，修改于2412251740