Write a python program that reads from a text file whose name is provided by the user, a list of a coffee shop products ordered by a customer (a sample input file is shown below). Each line contains item name, quantity and price (in biza) per product. Compute and display the total payment amount (in riyals) for each product as well as the total bill. Your program should consider the following erroneous cases: • The file does not open/exist • The format of the data in the file is incorrect (e.g. quantity = "!" or price "8&0"), in which case RuntimeError exception should be raised and the processing stops. Note: Make sure you close any open file even if an error occurs.

Write a python program that reads from a text file whose name is provided by the user, a list of a coffee shop products ordered by a customer (a sample input file is shown below). Each line contains item name, quantity and price (in biza) per product. Compute and display the total payment amount (in riyals) for each product as well as the total bill. Your program should consider the following erroneous cases: • The file does not open/exist • The format of the data in the file is incorrect (e.g. quantity = "!" or price "8&0"), in which case RuntimeError exception should be raised and the processing stops. Note: Make sure you close any open file even if an error occurs.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.

Question

Exercise 4:
Write a python program that reads from a text file whose name is provided by the user, a list of a
coffee shop products ordered by a customer (a sample input file is shown below). Each line
contains item name, quantity and price (in biza) per product. Compute and display the total
payment amount (in riyals) for each product as well as the total bill. Your program should consider
the following erroneous cases:
• The file does not open/exist
• The format of the data in the file is incorrect (e.g. quantity = "!" or price "8&0"), in
which case RuntimeError exception should be raised and the processing stops.
Note: Make sure you close any open file even if an error occurs.
Enter filename: order1.txt
Product
Qty
Payment
Expresso:2 1200
Turkish coffee:3 1250
2.40
3.75
Expresso
Turkish coffee
File contents invalid.
invalid literal for int() with base 10: '880'
Shish tawook:2 8&0
Coca cola:! 1300
3
Water 1/2L: 100
Total: 6.15
Sample input file
Sample output

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