$2$ make it beginner friendly and use doc strings to describe each part as well as make sure to use insertion sort for one of the steps : this is the data from the csv file :

sales

Branch, Product, Price, Units sold

Jumeirah, Pencil,$20,1$

Deira, Book,$50,3$

Jebel Ali, Notebook,$25,50$

Silicon Oasis, Eraser, $,31$

Jumeirah $1,$ Sequence Boardgame,$95,15$

International City, Python book,$115,25$

JVC$,$ Red pen, $,10$

JLT$,$ pocket notebook,$50,$