No module named yum

Question why

         Generally, the reason for this is yum And python The version of does not correspond to , because yum yes python Module , And there are multiple versions in your system python, So it will not correspond to

resolvent

         So modify yum Configuration of , Modify file ： vim /usr/bin/yum

# modify python Interpreter version 
#!/usr/bin/python  => #!/usr/bin/python2.7

         in addition We need to modify urlgrabber-ext-down Used interpreter , And yum Of python Unified version

vi /usr/libexec/urlgrabber-ext-down

#!/usr/bin/python  => #!/usr/bin/python2.7