Yum crashed with Keyboard Interrupt error

Question

I installed the newer version of python (3.2.3) than the one available in Fedora16 (python2.7)

And now yum stops working. It shows the following error.

[root@localhost yum-3.4.3]# yum
  File "/usr/bin/yum", line 30
   except KeyboardInterrupt, e:
                           ^
SyntaxError: invalid syntax

Please advice as how to resolve the error. It would be helpful as I am not able to update or install any package.

Answer 1

Because yum does not support Python3.
You can run command vi /usr/bin/yum, change /usr/bin/python to /usr/bin/python2 in first line.
Thus you can run the command yum by Python2 instead of Python3.

Note however that this will make your setup unsupported and thus unmaintainable (as does what you did). You will likely have other similar problems in the future with other system packages.
If you want to use an alternative Python installation, consider installing it into /usr/local, /opt or using pyenv.

Answer 2

This issue happens when user upgrades to python3, Just simply edit the file --> /usr/bin/yum and change to first line to --> "#!/usr/bin/python2"

The above solution wouldn't solve the all yum dependency problems, its better to run the below commands.

sudo ln -s /usr/local/bin/python3 /usr/bin/python3 (Mark latest python as python3)

sudo ln -sf /usr/bin/python2.7 /usr/bin/python (nake 2.7 as default python)

THanks, Daman

Answer 3

I'm guessing you installed Python 3.2.3 from source and used "make install" as the last command. That command has the unfortunate side-effect of replacing the system installed version command "python" with the new version. Using "make altinstall" doesn't replace "python".

The command "python" is just a symbolic link to "python2", which in turn is a symbolic link to "python2.7". You should be able to restore "python" by executing the following command:

cd /usr/bin
sudo ln -s python2 python

Answer 4

Thanks Damanvir! Changing the line in /usr/bin/yum worked!

This is a little off topic and might be removed but it might help someone.

These are the steps I used to install Python 3.7 on Centos and fix the yum error.

Download from https://www.python.org/

tar -xvf
./configure --enable-optimizations

make
make install

OR

make altinstall

make altinstall is used to prevent replacing the default python binary file /usr/bin/python.

cd /usr/bin

Remove the current symbolic link to the previous version

rm python

OUTPUT: rm: remove symbolic link ‘python’? y

Find the location of the new version

whereis python3.7
 OUTPUT: python3: /usr/local/bin/python3.7

Verify this is correct

  /usr/local/bin/python3.7 --version
  OUTPUT: Python 3.7.0

Create a symbolic link to the location of the new version

ln -s /usr/local/bin/python3.7 python

python --version

OUTPUT: Python 3.7.0

Yum commands will show the following error:

  File "/bin/yum", line 30
      except KeyboardInterrupt, e:

  SyntaxError: invalid syntax

Change the top line of this file from using python to python2

  vi /usr/bin/yum 
    #!/usr/bin/python2

Reference: https://tecadmin.net/install-python-3-7-on-centos/