upgrade python in anaconda code example

Example 1: update anaconda from cmd

// to update anaconda 
conda update conda

// to update all anaconda package
conda update --all

Example 2: anaconda python update packages

conda update --all

Example 3: how to downgrade python to 3.7 4 anaconda

conda install python=3.5.0

 # or maybe 

 conda install python=2.7.8

 # or whatever you want....