Using a different version of python (linux)

change_version.sh

# Check versions of python installed
ls /usr/bin/python*

# Check your current python version
python --version
# Python 2.7.8

# Change alias of Python
alias python='/usr/bin/python3.5'   
# or whatever version you have installed and want to switch to

# Re-login to your bash
. ~/.bashrc
# notice the dot(.)

# now again check your updated version
python --version

# That's it