2. Write a program that uses a dictionary to assign "codes" to each letter of the alphabet. For example: codes = { 'A': '%', 'a': '9', 'B': '@', 'b': '#', etc...). Using this example, the letter 'A' would be assigned the symbol '%', the letter 'a' would be assigned the number '9', the letter 'B' would be assigned the symbol '@', and so forth. Also, if there is an item 'K':'Z', then have an item 'Z':'K'. Encryption and decryption are inverse of one another. You may consider assigning codes to only alphabets (either lower case or upper case) and ignore special characters and digits. The program should open a specified text file, read its contents, and then use the dictionary to write an encrypted version of the file's contents to a second file. Each character in the second file should contain the code for the corresponding character in the first file. Write a second program that opens an encrypted file and displays its decrypted contents on the screen.

2. Write a program that uses a dictionary to assign "codes" to each letter of the alphabet. For example: codes = { 'A': '%', 'a': '9', 'B': '@', 'b': '#', etc...). Using this example, the letter 'A' would be assigned the symbol '%', the letter 'a' would be assigned the number '9', the letter 'B' would be assigned the symbol '@', and so forth. Also, if there is an item 'K':'Z', then have an item 'Z':'K'. Encryption and decryption are inverse of one another. You may consider assigning codes to only alphabets (either lower case or upper case) and ignore special characters and digits. The program should open a specified text file, read its contents, and then use the dictionary to write an encrypted version of the file's contents to a second file. Each character in the second file should contain the code for the corresponding character in the first file. Write a second program that opens an encrypted file and displays its decrypted contents on the screen.

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

See similar textbooks

Similar questions

A Python dictionary that returns a list of values for each key. The dictionary will contain information about my favorite books, including the title, author, and year of publication. The key will be the title of the book, and the values will be a list containing the author and the year of publication. favorite_books = { "The Great Gatsby": ["F. Scott Fitzgerald", 1925], "To Kill a Mockingbird": ["Harper Lee", 1960], "1984": ["George Orwell", 1949]} NOTE: You can replace the book details as your need in above code. Next, modify the invert_dict function from Section 11.5 of "Think Python" to invert my dictionary. The modified function will need to turn each of the list items into separate keys in the inverted dictionary. def invert_dict(d): inverse = dict() for key in d: vals = d[key] for val in vals: if val not in inverse: inverse[val] = [key] else: inverse[val].append(key) return inverse Here, the…
Assignment 5A: Multiple Frequencies. In the last assignment, we calculated the frequency of a coin flip. This required us to have two separate variables, which we used to record the number of heads and tails. Now that we know about arrays, we can track the frequency of all numbers in a randomly generated sequence. For this program, you will ask the user to provide a range of values (from 1 to that number, inclusive) and how long of a number sequence you want to generate using that number range. You will then generate and save the sequence in an array. After that, you will count the number of times each number occurs in the sequence, and print the frequency of each number. Hints: You can use multiple arrays for this assignment. One array should hold the number sequence, and another could keep track of the frequencies of each number. Sample Output #1: What's the highest number you want to generate?: 5 How Long of a number sequence do you want to generate?: 10 Okay, we'll generate 10…
You will be given a dictionary, where the name of a student will be the key and a list of courses will be the value. Now, you have to take a course name as input until the user gives 'STOP' in the input. Your task is to display the list of the students taken that course after each input. Given Dictionary { 'Mike' : ['CSE110","ENG101','MAT110'], "Simon' : ['CSE111',"PHY111',"MAT110", 'CSE230], "Shawn' : ['CSE110',"ENG101',"MAT120','CSE230'], 'Alice' : ['CSE110',"ENG091','MAT092'] } Sample Input 1 CSE110 МAT110 CSE260 STOP Sample Output 1 [ 'Mike', "Shawn', 'Alice' ] [ 'Mike', "Simon'] [] Explanation 1: Mike, Shawn and Alice are doing CSE110 Mike and Simon are doing MAT110 No student is doing CSE260
In C Programming Language Palindrome: “A palindrome is a word, phrase, number, or other sequence of characters which reads the same backward or forward, such as ‘madam’ or ‘kayak’” (excerpt from Wikipedia).Write a program that reads 8 words from Palindrome.txt and checks whether the word you read is a palindrome (please read its description above) or not. Print the index numbers of all the palindrome words in your array. You are required to read words character by character into a character array.• Write readFile function, which gets a file pointer and a two-dim array, to read each word(bunch of characters) line by line and store them into a two-dim character array.• Write findSize function takes a one-dim array and returns its actual size.• Write isPalindrome function takes a one-dim character array to check whether the content is a polindrome or not. If the word (character squence) is a palindrome, then it returns 1. Otherwise, it returns 0.
you have the following dictionary. Just copy the dictionary from the question to your editor sitcom={ 'friends': ['joey', 'rachel'], 'BBT': ['sheldon', 'leonard'], 'brooklyn 99': ['amy', 'rosa']} Write a python function that will take the dictionary as a parameter and also an integer that will be given by the user. Then you have to find out which key’s corresponding values have the length same as the user input. Then print the following. NB: Your code needs to be worked if the given dictionary is changed. (You can not use the len(), count() functions) Sample Input 1: 14 function call 1: sitcom_calc(sitcom,value) Sample Output 1: sheldon leonard are the bestest friends ever Explanation: Here, the user input is 14. When the key is ‘friends’, the length of its corresponding values are 4 (joey)+ 6 (rachel) =10. So, they don't match. Now, when the key is ‘BBT’ the length of its corresponding values are 7 (sheldon)+ 7 (leonard) =14. So, match! That’s why, sheldon leonard…
In this exercise, you will create a Python script that represents a restaurant menu using a dictionary. Here's how the program should work: 1. Create a dictionary called menu that represents the restaurant menu. Each key in the dictionary should be a string representing a menu item, and each value should be a float representing the price of the item. Menu: - Burger: $10.99 - Fries: $3.99 - Salad: $7.99 - Milkshake: $5.99 2. Print out the menu using a for loop. The output should include the name of each item and its price. 3. Prompt the user to enter the name of a menu item they would like to order. 4. Check if the item exists in the menu. If it does, print out the price of the item. If it does not, print out a message indicating that the item is not on the menu.
This is in Python Capital Quiz. This is a problem in which you use dictionaries. Write a program that creates a dictionary containing twenty (only twenty) States of the United States and their State Capitals. The States of the United States should be the keys. The program also should randomly quiz the user by displaying the name of a State and asking the user to enter that state's capital. The program should keep of a count of the number of correct responses. The program should ask the user how many times the user wants to play. If the user says 6, the quiz should run six times and the final output should say, you played this game six times and you got the answers correct four times (if the user got four answers correct).
IN PYTHON******* Write a program to calculate the total price for car wash services. A base car wash is $10. A dictionary with each additional service and the corresponding cost has been provided. Two additional services can be selected. A '-' signifies an additional service was not selected. Output all selected services along with the corresponding costs and then the total price for all car wash services. Ex: If the input is: Tire shine Wax the output is: ZyCar Wash Base car wash -- $10 Tire shine -- $2 Wax -- $3 ---- Total price: $15 Ex: If the input is: Rain repellent - the output is: ZyCar Wash Base car wash -- $10 Rain repellent -- $2 ---- Total price: $12
Using Python, write a program which opens a text file and loads the data into a dictionary where the key is the line # from the file and the value is the line of text from the file. For instance, if the file looks like: Hello,Welcome to Introduction to Big Data It is good to meet everyone.Hope you enjoy the class. The dictionary should look like: KEY VALUE 1 Hello, 2 Welcome to Introduction to Big Data 3 It is good to meet everyone. 4 Hope you enjoy the class. Then change it to a list and reverse the order of the lines of text and save it back to a new text file.
given a dictionary of characters with their favorite foods. sort the characters and their favorite foods. return a dictionary where the keys are characters and the values are the friends who like the same foods. if more than one character likes the same food sort alphabetically. >>> friends1 = {"Famy": ["pizza", "chocolate"], "Nihal": ["chocolate","hotdog"], "Amy":["chocolate", "chips"]} >>> friendsfoods(friends1) {'pizza': ['Famy'], 'chocolate': ['Amy', 'Famy', 'Nihal'], 'hotdog': ['Nihal'], 'chips': ['Amy']} >>> friends2 = {'Alissa': ['pizza', 'hotdog'], 'Arun': ['pizza', 'chips'], 'Michele': ['icecream', 'burger', 'fries']} >>> friendsfoods(friends2) {'pizza': ['Alissa', 'Arun'], 'hotdog': ['Alissa'], 'chips': ['Arun'], 'icecream': ['Michele'], 'burger': ['Michele'], 'fries': ['Michele']} Subject: Python Programming
IN PYTHON PLEASE This program will store roster and rating information for a soccer team. Coaches rate players during tryouts to ensure a balanced team. (1) Prompt the user to input five pairs of numbers: A player's jersey number (0 - 99) and the player's rating (1 - 9). Store the jersey numbers and the ratings in a dictionary. Output the dictionary's elements with the jersey numbers in ascending order (i.e., output the roster from smallest to largest jersey number). Hint: Dictionary keys can be stored in a sorted list. (3 pts) Ex: Enter player 1's jersey number: 84 Enter player 1's rating: 7 Enter player 2's jersey number: 23 Enter player 2's rating: 4 Enter player 3's jersey number: 4 Enter player 3's rating: 5 Enter player 4's jersey number: 30 Enter player 4's rating: 2 Enter player 5's jersey number: 66 Enter player 5's rating: 9 ROSTER Jersey number: 4, Rating: 5 Jersey number: 23, Rating: 4 Jersey number 30, Rating: 2 ... (2) Implement a menu of options for a user to modify the…
Python please: Write a program to calculate the total calories in a lunch. Each lunch comes with a pickle that is 7 calories. A dictionary with each additional food item and the corresponding calorie count has been provided. Up to four items can be selected. A '-' signifies an additional item was not selected. Output all selected items along with the corresponding calories and then the total calories for the entire lunch. Example: If the input is Wrap Soda French Fries Cookie the output is ZyDeli Lunch Counter Pickle calories -- 7 cal Wrap -- 890 cal Soda -- 160 cal French Fries -- 365 cal Cookie -- 190 cal ---- Total calories: 1612 cal Example: If the input is French Fries Soda - Cookie the output is ZyDeli Lunch Counter Pickle calories -- 7 cal French Fries -- 365 cal Soda -- 160 cal Cookie -- 190 cal ---- Total calories: 722 cal