What to write or search on github to get the code for what is written below:

[NArshad]

-“How are the relevant cells identified in the spreadsheet?”
The column headings are:
BOOK_NAME
BOOK_AUTHOR
BOOK_ISBN
TOTAL_COPIES
COPIES_LEFT
BORROWER’S_NAME
ISSUE_DATE
RETURN_DATE


-“It's often the case that the cells on the first row contain text as column labels.” 

These I have written above.


-“If that's what you have in your spreadsheet, then read the cells on the first row for the column labels and put them in a dict to map from column label to column number.”

This written above I do not understand how to code.