Importing Python File from Other Folder

Yesterday I am trying a simple machine learning project from Udacity. There are bunch of files provided and sometime we have to link one another through importing it. It got me frustrated when trying it repeatedly and still got the same error.

Converting Code of Python 2 to Python 3

If you are beginner, it might be frustrating when you find a code in github or other sources that is written in Python 2 while you the python you have is version 3. Some of you might think to convert it manually (like what I did), but it going to be crazy to look thoroughly at hundreds or even thousands of lines of code.