Python3实现requests请求下载url文件到指定目录

python2 实现参考：https://blog.csdn/tankpanv/article/details/100731081

python3版本

def urldownload(url,filename=None):
    """
    下载文件到指定目录
    :param url: 文件下载的url
    :param filename: 要存放的目录及文件名，例如：./test.xls
    :return:
    """
    down_res = requests.get(url)
    with open(filename,'wb') as file:
        file.write(down_res.content)

判断下载文件是否存在

   import os
   def test_download():
        url =  self.download()
        Common.urldownload(url,filename='./test.xls')
        # path = pathlib.Path('./test.xls')  #方法一
        path = './test.xls'  
        assert os.path.exists(path)==True   #方法二
        os.remove(path)