Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
4th Edition
ISBN: 9780134444321
Author: Tony Gaddis
Publisher: PEARSON
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Chapter 9, Problem 3PE
File Encryption and Decryption
Write a
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. The program should open a specified text file, read its contents, 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.
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Chapter 9 Solutions
Starting Out with Python (4th Edition)
Ch. 9.1 - An element in a dictionary has two parts. What are... Ch. 9.1 - Which part of a dictionary element must be... Ch. 9.1 - Suppose ' start' : 1472 is an element in a... Ch. 9.1 - Suppose a dictionary named employee has been... Ch. 9.1 - What will the following code display? stuff = {1 :... Ch. 9.1 - Prob. 6CP Ch. 9.1 - Suppose a dictionary named inventory exists. What... Ch. 9.1 - What will the following code display? stuff = {1 :... Ch. 9.1 - What will the following code display? stuff = {1 :... Ch. 9.1 - What is the difference between the dictionary...
Ch. 9.1 - Prob. 11CP Ch. 9.1 - Prob. 12CP Ch. 9.1 - What does the values method return? Ch. 9.2 - Prob. 14CP Ch. 9.2 - Prob. 15CP Ch. 9.2 - Prob. 16CP Ch. 9.2 - After the following statement executes, what... Ch. 9.2 - After the following statement executes, what... Ch. 9.2 - After the following statement executes, what... Ch. 9.2 - After the following statement executes, what... Ch. 9.2 - After the following statement executes, what... Ch. 9.2 - Prob. 22CP Ch. 9.2 - After the following statement executes, what... Ch. 9.2 - After the following statement executes, what... Ch. 9.2 - Prob. 25CP Ch. 9.2 - Prob. 26CP Ch. 9.2 - After the following code executes, what elements... Ch. 9.2 - Prob. 28CP Ch. 9.2 - After the following code executes, what elements... Ch. 9.2 - After the following code executes, what elements... Ch. 9.2 - After the following code executes, what elements... Ch. 9.2 - Prob. 32CP Ch. 9.3 - Prob. 33CP Ch. 9.3 - When you open a file for the purpose of saving a... Ch. 9.3 - When you open a file for the purpose of retrieving... Ch. 9.3 - Prob. 36CP Ch. 9.3 - Prob. 37CP Ch. 9.3 - Prob. 38CP Ch. 9 - You can use the __________ operator to determine... Ch. 9 - You use ________ to delete an element from a... Ch. 9 - The ________ function returns the number of... Ch. 9 - You can use_________ to create an empty... Ch. 9 - The _______ method returns a randomly selected... Ch. 9 - The __________ method returns the value associated... Ch. 9 - The __________ dictionary method returns the value... Ch. 9 - The ________ method returns all of a dictionary's... Ch. 9 - The following function returns the number of... Ch. 9 - Prob. 10MC Ch. 9 - Prob. 11MC Ch. 9 - This set method removes an element, but does not... Ch. 9 - Prob. 13MC Ch. 9 - Prob. 14MC Ch. 9 - This operator can be used to find the difference... Ch. 9 - Prob. 16MC Ch. 9 - Prob. 17MC Ch. 9 - The keys in a dictionary must be mutable objects. Ch. 9 - Dictionaries are not sequences. Ch. 9 - Prob. 3TF Ch. 9 - Prob. 4TF Ch. 9 - The dictionary method popitem does not raise an... Ch. 9 - The following statement creates an empty... Ch. 9 - Prob. 7TF Ch. 9 - Prob. 8TF Ch. 9 - Prob. 9TF Ch. 9 - Prob. 10TF Ch. 9 - What will the following code display? dct =... Ch. 9 - What will the following code display? dct =... Ch. 9 - What will the following code display? dct =... Ch. 9 - What will the following code display? stuff =... Ch. 9 - How do you delete an element from a dictionary? Ch. 9 - How do you determine the number of elements that... Ch. 9 - Prob. 7SA Ch. 9 - What values will the following code display? (Dont... Ch. 9 - After the following statement executes, what... Ch. 9 - After the following statement executes, what... Ch. 9 - After the following statement executes, what... Ch. 9 - After the following statement executes, what... Ch. 9 - After the following statement executes, what... Ch. 9 - What will the following code display? myset =... Ch. 9 - After the following code executes, what elements... Ch. 9 - Prob. 16SA Ch. 9 - Prob. 17SA Ch. 9 - Prob. 18SA Ch. 9 - After the following code executes, what elements... Ch. 9 - Prob. 20SA Ch. 9 - Write a statement that creates a dictionary... Ch. 9 - Write a statement that creates an empty... Ch. 9 - Assume the variable dct references a dictionary.... Ch. 9 - Assume the variable dct references a dictionary.... Ch. 9 - Prob. 5AW Ch. 9 - Prob. 6AW Ch. 9 - Prob. 7AW Ch. 9 - Prob. 8AW Ch. 9 - Prob. 9AW Ch. 9 - Prob. 10AW Ch. 9 - Assume the variable dct references a dictionary.... Ch. 9 - Write code that retrieves and unpickles the... Ch. 9 - Course information Write a program that creates a... Ch. 9 - Capital Quiz The Capital Quiz Problem Write a... Ch. 9 - File Encryption and Decryption Write a program... Ch. 9 - Unique Words Write a program that opens a... Ch. 9 - Prob. 5PE Ch. 9 - File Analysis Write a program that reads the... Ch. 9 - World Series Winners In this chapters source code... Ch. 9 - Name and Email Addresses Write a program that... Ch. 9 - Blackjack Simulation Previously in this chapter... Ch. 9 - Word Index Write a program that reads the contents...
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