update flask linux code example

bootstrap background color classes code example how to isntall python code example how to format indentation in visual studio code code example mysql select list of views in database code example how to print array size o pyhton code example check if string is only numbers code example inheritance in c# code example what is virtual env code example innerHTML convert t node code example name error is not defined code example sql copy data from one table to another code example js return even numbers in an array even - even numbers code example