Let's say that we have a dictionary called stock that contains stock details and each entry follows this format: SYM:[Name,Price,Prev].  Using Python, create a function that writes the contents of stock to a file. Each line should contain one entry that follows this format: SYM,Name,Price,Prev  e.g. stock = {"ABS":["ABS-CBN Corp.",20.2,20.9],                "AC" :["Ayala Corp.",910.5,930],                "CEB":["Cebu Air Inc.",67.4,67.45],                "JFC":["Jollibee Foods Corp.",252.8,243]} (in stock.txt) ABS,ABS-CBN Corp,20.2,20.9 AC,Ayala Corp,910.5,930 CEB,Cebu Air Inc,67.4,67.45 JFC,Jollibee Foods Corp,252.8,243

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Stack operations

A stack is a linear data structure that follows certain order to perform the operation; the order will be LIFO (Last In First Out) data structure. In the stack data structure elements/items are removed and added only from the top. The topmost stack item/element is pointed by the top pointer and the element which is added to the stack first will get deleted at the last.