[root@VM_88_10_centos ~]# yum update Repository epel is listed more than once in the configurationhttp://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not
def download(source_url): agents = ['Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0)','Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 5.1)','Microsoft Internet Explorer/4.0b1 (Windows 95)','Opera/8.00 (Windows NT 5.1; U; en)']