python - "No module named yum"centos7

Question

我的操作系统是 CentOS Linux release 7.4.1708

首先，我为 python 安装了 anaconda。然后我替换了/usr/bin/python 中的默认 python。

$ ll /usr/bin/python*
lrwxrwxrwx. 1 root root  7 Aug 15 03:40 /usr/bin/python -> python2
lrwxrwxrwx. 1 root root  9 Aug  9 22:10 /usr/bin/python3 -> python3.6
lrwxrwxrwx. 1 root root 29 Aug  9 22:10 /usr/bin/python2.7 -> /root/anaconda2/bin/python2.7
lrwxrwxrwx. 1 root root 29 Aug  9 21:59 /usr/bin/python3.6 -> /root/anaconda3/bin/python3.6
lrwxrwxrwx. 1 root root  9 Aug  8 23:49 /usr/bin/python2 -> python2.7


Python 2.7.15 |Anaconda, Inc.| (default, May  1 2018, 23:32:55)
[GCC 7.2.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

所以我不能再使用 yum。

$ yum
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   No module named yum

Please install a package which provides this module, or
verify that the module is installed correctly.

It's possible that the above module doesn't match the
current version of Python, which is:
2.7.15 |Anaconda, Inc.| (default, May  1 2018, 23:32:55)
[GCC 7.2.0]

If you cannot solve this problem yourself, please go to
the yum faq at:
  http://yum.baseurl.org/wiki/Faq

我尝试将第一行 vi/usr/bin/yum 修复到任何其他 python 路径。但它不起作用。

另外，我正在尝试像这样重新安装 python*.rpm:

rpm -ivh python-tools-2.7.5-68.el7.x86_64.rpm python-2.7.5-68.el7.x86_64.rpm python-libs-2.7.5-68.el7.x86_64.rpm tkinter-2.7.5-68.el7.x86_64.rpm

并重新安装yum*.rpm(我今天下载了很多*.rpm...)但是，还是不行。有人帮我吗？谢谢!

Answer 1

我最近在 CentOS7 上用 Yum3.4.3，Python2.7.5 遇到了这个问题，

[root@centos64b build]# yum list There was a problem importingone of the Python modules required to run yum. The error leading tothis problem was:

No module named yum

Please install a package which provides this module, or verify thatthe module is installed correctly.

It's possible that the above module doesn't match the current versionof Python, which is:2.7.5 (default, Apr 11 2018, 07:36:10) [GCC 4.8.5 20150623 (Red Hat 4.8.5-28)]

If you cannot solve this problem yourself, please go to the yum faqat: http://yum.baseurl.org/wiki/Faq

虽然我在遇到这个问题之前没有更新Python。最后发现sys.path中没有设置python site-packages libpath，所以这里的修复是在/usr/bin/yum Python脚本中将site-package libpath追加到sys.path中。然后 yum 工作正常。

[build@centos64b ~]$ more /usr/bin/yum
#!/usr/bin/python
import sys
sys.path.append('/usr/lib/python2.7/site-packages')
sys.path.append('/usr/lib64/python2.7/site-packages')