Caesar Cipher 4 reddit

'''This function takes a message string, and encrypts it based on a
Ceaser Shift to the nth position'''

def rot(msg,n):`

    #Set the alphabet, include spaces
    alphabet = "abcdefghijklmnopqrstuvwxyz "

    #Create a key - Here, I am splitting the original string at the nth index,
    #then tacking on the rest of it to the end
    rotation=alphabet[n:]+alphabet[:n]

    #Initialize your cipertext variable as blank string
    newstring=''

    #Iterate through message string, character by character
    for i in msg:

        #If the character is a space, we will simply add a space instead of shifting
        if i == ' ':
            newstring+=i

        #If the character is not a space, take the
        #character's index in the alphabet, and add its correspondent to the cipher string
        else:
            newstring+=rotation[alphabet.index(i)]

    return newstring

#Testing...
def testfunctions():
    msg= input('Message: ')

    #Needs to take an integer value.
    #Input makes it a string, so need int() to convert
    n = int(input('Rotation: '))
    print('Rot',n,': ',rot(msg,n))