Answered: Exercise 3: Add a new command call 'I'…

Exercise 3: Add a new command call 'I' which will perform exact same as 'Is -a'. Exercise 4: Create a function call sortFile, which will sort all filenames of current directory.

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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Assume that there is a valid file cards.txt in the current directory which contains 10 valid int values, each on its own line. Write a function which reads all the values from the file and returns the maximum of the values. Your function must have the following signature: int cardsMax (); You do not need to demonstrate calling this function from main).
● Exercise Exercise 3: Add a new command call 'I' which will perform exact same as 'Is -a'. ● • Exercise 4: Create a function call sortFile, which will sort all filenames of current directory.
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2. Create a contacts module to meet the following requirements: i. Create a file named contacts.py. a. Define a class named Contacts. a. Define a member function named_init_ to meet the following requirements: a. Take a self as a positional parameter. b. Take a filename as a keyword parameter. c. Set a member variable equal to the filename. d. Set a member varialbe equal to an empty data dictionary. e. Open the filename and load the JSON decoded contents to the empty data dictionary. f. Cleanly manage the FileNotFoundError if the filename does not exist. b. Define a member function named add_contact to meet the following requirements: a. Take a self as a positional parameter. b. Take a id as a keyword parameter. c. Take a first_name as a keyword parameter. d. Take a last_name as a keyword parameter. e. If the id exists in the data dictionary, return the string error. f. Set the id:[first_name, last_name] key:value pair to the data dictionary. g. Sort the data dictionary in ascending…
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