输入文件url，下载该文件

def download(url):
    """输入文件url，下载该文件"""
    file_name = os.path.split(url)[1]
    file = urlopen(url)
    with open(file_name, 'wb') as f:
        f.write(file.read())
        print("文件下载成功：%s " % file_name)