Problem 1: Costco Stock SMA

Objective 

● list and string handling: split, indexing, len() 

● list comprehension, with if and else 

● if statement 

● file reading, csv file handling (csv: comma separated values) 

● nan: not a number. matplotlib will auto ignore all 'nan' entries. 

● matplotlib: make line plots, line/dot style, label, saving figure 

● self learning. (google and follow example)