Method 1

When you install Debian Linux when , The installation process may provide you with multiple available Python edition , So there will be multiple Python Executable binaries for . You can use ls Command to see what is in your system Python Binary files of are available for use .

ls /usr/bin/python*

/usr/bin/python /usr/bin/python2 /usr/bin/python2.7 /usr/bin/python3 /usr/bin/python3.4 /usr/bin/python3.4m /usr/bin/python3m
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Execute the following command to view the default Python Version information :

python --version

Python 2.7.8
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1、 User based modification Python edition ：

Want to modify... For a specific user Python edition , Just in it home Create one in the directory alias( Alias ) that will do . Open the user's ~/.bashrc file , Add new alias information to modify the default alias Python edition .

vim ~/.bashrc

alias python='/usr/bin/python3.4'

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Once the above operations are completed , Log in again or reload .bashrc file , Make the operation effective .

 . ~/.bashrc

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Check the current Python edition .

python --version

Python 3.4.2

Method 2

which python3

/data/anaconda3/bin/python3

cd /usr/bin

ls -l | grep python

sudo rm -rf python

sudo ln -s /usr/bin/python3 /usr/bin/python

sudo ln -s /usr/bin/python2 /usr/bin/python

Restart the client to take effect