Python program Use the provided shift function to create a caesar cipher program. Your program s...
python program
Use the provided shift function to create a caesar cipher
program.
Your program should have a menu to offer the following
options:
Read a file as current message
Save current message
Type in a new message
Display current message
"Encrypt" message
Change the shift value
For more details, see the comments in the provided code.
NO GLOBAL VARIABLES!
Complete the program found in assignment.py. You may not change any
provided code. You may only complete the sections labeled:#YOUR
CODE HERE
Submit source file and screenshot by the posted due date.
------------------------------------------------------
assignment.py:
shift takes a single character and an integer value as
arguments
# Any character not == a-z or A-Z will be returned as is
# Any letter will be shifted by numPlaces in the alphabet
# shift('a',1) will return b
# shift('z',1) will return a
# shift('a',-1) will return z
def shift(letter, numPlaces):
digit = ord(letter)
numPlaces = numPlaces %26
if digit >= 65 and digit <= 122:
if digit <=90:
digit = (((digit - 65)+numPlaces)%26) + 65
elif digit >= 97:
digit = (((digit - 97)+numPlaces)%26) + 97
return chr(digit)
# Read a message from a file
# Read the entire contents into a single string
# Return the string
def readMessage():
#YOUR CODE HERE
return message
# Save the current message to a file
# Over write the file with the entire message string
# Do not return anything
def saveMessage(message):
#YOUR CODE HERE
# Print out the current message
# Nothing more
def displayMessage(message):
#YOUR CODE HERE
# Enter a new message from the keyboard
# Return the new message
def typeMessage():
#YOUR CODE HERE
# Change the shift value
# Prompt the user to enter a new shift value
# Return this new value as an int
def changeShift():
#YOUR CODE HERE
# "Encrypt" the message by shifting
# each character of the message by myShift
# Use the shift function here
# Return the new message
def encrypt(message,myShift):
newMsg = ""
#YOUR CODE HERE
return newMsg
# Create a menu for user
def menu(message,myShift):
#YOUR CODE HERE
# Basic setup stuff
def main():
message = ""
myShift = 5
menu(message,myShift)
main()
Homework Answers
Screenshot:-
Program
import os
# Any character not == a-z or A-Z will be returned as is
# Any letter will be shifted by numPlaces in the alphabet
# shift('a',1) will return b
# shift('z',1) will return a
# shift('a',-1) will return z
def shift(letter, numPlaces):
digit = ord(letter)
numPlaces = numPlaces %26
if digit >= 65 and digit <= 122:
if digit <=90:
digit = (((digit - 65)+numPlaces)%26) + 65
elif digit >= 97:
digit = (((digit - 97)+numPlaces)%26) + 97
return chr(digit)
# Read a message from a file
# Read the entire contents into a single string
# Return the string
def readMessage():
while(True):
fName=input('Enter file to read: ')
message=''
if os.path.exists(fName):
with open(fName) as f:
while True:
c = f.read(1)
if not c:
break
message+=str(c)
break
else:
print('File not open')
return message
# Save the current message to a file
# Over write the file with the entire message string
# Do not return anything
def saveMessage(message):
while(True):
fName=input('Enter file to write: ')
if os.path.exists(fName):
f = open("demofile2.txt", "a")
f.write(message)
f.close()
break
else:
print('File not open')
# Print out the current message
# Nothing more
def displayMessage(message):
print('\nMessage=',message)
# Enter a new message from the keyboard
# Return the new message
def typeMessage():
message=input('Enter a message: ')
return message
# Change the shift value
# Prompt the user to enter a new shift value
# Return this new value as an int
def changeShift():
shift=int(input('Enter a shift value: '))
return shift
# "Encrypt" the message by shifting
# each character of the message by myShift
# Use the shift function here
# Return the new message
def encrypt(message,myShift):
newMsg = ""
for i in range(len(message)):
newMsg+=shift(message[i],myShift)
return newMsg
# Create a menu for user
def menu(message,myShift):
while(True):
print('\n1. Read a file as current message\n2. Save current
message\n3. Type in a new message')
print('4. Display current message\n5. "Encrypt" message\n6. Change
the shift value\n7. Quit')
opt=int(input("Enter your option(1-7): "));
while(opt<1 or opt>7):
print("\nError!!!Options from 1 to 7, retry\n")
print('1. Read a file as current message\n2. Save current
message\n3. Type in a new message')
print('4. Display current message\n5. "Encrypt" message\n6. Change
the shift value\n7. Quit')
opt=int(input("Enter your option(1-7): "));
if(opt!=7):
if(opt==1):
message=readMessage()
elif(opt==2):
saveMessage(message)
elif(opt==3):
message=typeMessage()
elif(opt==4):
displayMessage(message)
elif(opt==5):
message=encrypt(message,myShift)
elif(opt==6):
myShift=changeShift()
else:
print(' Good Bye')
break
# Basic setup stuff
def main():
message = ""
myShift = 5
menu(message,myShift)
main()
--------------------------------------------------------------------
Output
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 8
Error!!!Options from 1 to 7, retry
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 1
Enter file to read: check.txt
File not open
Enter file to read: C:/Users/deept/Desktop/check.txt
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 4
Message= Hello world
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 2
Enter file to write: check.txt
File not open
Enter file to write: C:/Users/deept/Desktop/check.txt
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 3
Enter a message: Hello
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 5
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 4
Message= Mjqqt
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 6
Enter a shift value: 2
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 3
Enter a message: Hello
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 5
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 4
Message= Jgnnq
1. Read a file as current message
2. Save current message
3. Type in a new message
4. Display current message
5. "Encrypt" message
6. Change the shift value
7. Quit
Enter your option(1-7): 7
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