set default python to python3 code example
Example 1: update link python is python 3
$ python --version
Python 2.7.6
$ python3 --version
Python 3.4.3
$ alias python=python3
$ python --version
Python 3.4.3
Example 2: transition from python 2 to 3 terminal
alias python="python3"
Example 3: update link python is python 3
$ \python --version
Python 2.7.6
Example 4: update link python is python 3
$ command python --version
Python 2.7.6