Variables Simply put, variables are like envelopes. They are empty and meaningless until we place objects and meaning into them and give the envelope a name. When you call up a variable in Python ...

This thread is a good example of how having the wrong mental model can force your brain to twist itself in knots to explain simple behavior, whereas having the right mental model makes the same ...

6. Gap Analysis with Categorical Variables 6.1. Preliminaries¶ I include the data import and library import commands at the start of each lesson so that the lessons are self-contained.