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Changes:
printing needs
incompliance in user input
shopping_list[3] without additional dialog, including via strings such
as "Remove potatoes" to remove item from shopping_list equal to
"potatoes" and error handling for "This isn't in your list.")
list, default false to print shopping list - useful for printing inside
functions such as input() and write()
count variable
New requirements:
import os.path.isfile