Edit /usr/bin/yum, change python in the first line to python2.6

You want to upgrade yum to python2.7, right? You only need to resolve the corresponding dependencies. However, the process is a bit cumbersome.

Edit /usr/bin/yum and change the python in the first line to python2.6. The error message is

Traceback (most recent call last):
  File "/usr/bin/yum", line 28, in <module>
    import yummain
  File "/usr/share/yum-cli/yummain.py", line 34, in <module>
    import cli
  File "/usr/share/yum-cli/cli.py", line 34, in <module>
    import output
  File "/usr/share/yum-cli/output.py", line 450
    self.reported_error_msgs = {k: False for (k, v) in ERRORS_TO_KBASE_ARTICLES.iteritems()}
                                           ^

SyntaxError: invalid syntax