# The first message in the file was decrypted, its plaintext is:   plain_text = 'PICK UP THAT CAN CITIZEN'   # create a list of characters of the alphabet   alphabet_list = list('ABCDEFGHIJKLMNOPQRSTUVWXYZ')   # use list compression to create the alphabet mapping to the integers, starting   with 0   alphabet_int_list = [i for i in range(0,26)]   # create a list to hold the encrypted message strings   encrypted_messages_list = []   # open the file of encrypted messages in read mode, call it encrypted_messages_file   with open('encrypted_messages.txt', 'r') as encrypted_messages_file:   # readlines() reads all the lines of a file in one go and returns each line as   a string element in a list   encrypted_messages_list = encrypted_messages_file.readlines()   # we use list compression to, for each line in the list, remove the whitespace   (i.e. the new line character)   # and then store the results in a list   encrypted_messages_list = [line.strip() for line in encrypted_messages_list]   print(encrypted_messages_list)           Subject: Python Programming

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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# The first message in the file was decrypted, its plaintext is:

 

plain_text = 'PICK UP THAT CAN CITIZEN'

 

# create a list of characters of the alphabet

 

alphabet_list = list('ABCDEFGHIJKLMNOPQRSTUVWXYZ')

 

# use list compression to create the alphabet mapping to the integers, starting

 

with 0

 

alphabet_int_list = [i for i in range(0,26)]

 

# create a list to hold the encrypted message strings

 

encrypted_messages_list = []

 

# open the file of encrypted messages in read mode, call it encrypted_messages_file

 

with open('encrypted_messages.txt', 'r') as encrypted_messages_file:

 

# readlines() reads all the lines of a file in one go and returns each line as

 

a string element in a list

 

encrypted_messages_list = encrypted_messages_file.readlines()

 

# we use list compression to, for each line in the list, remove the whitespace

 

(i.e. the new line character)

 

# and then store the results in a list

 

encrypted_messages_list = [line.strip() for line in encrypted_messages_list]

 

print(encrypted_messages_list)

 

 

 

 

 

Subject: Python Programming

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