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Python strings have a translate method that applies a substitution cipher. There is also a function str.maketrans (string.maketrans in Python 2) that helps with building the translation table:

>>> from string import ascii_lowercase as alphabet
>>> shift = 13
>>> cipher = str.maketrans(alphabet, alphabet[shift:] + alphabet[:shift])
>>> print("caeser salad is tasty".translate(cipher))
pnrfre fnynq vf gnfgl

Python strings have a translate method that applies a substitution cipher. There is also a function str.maketrans (string.maketrans in Python 2) that helps with building the translation table:

>>> from string import ascii_lowercase as alphabet
>>> shift = 13
>>> cipher = str.maketrans(alphabet, alphabet[shift:] + alphabet[:shift])
>>> print("caeser salad is tasty".translate(cipher))
pnrfre fnynq vf gnfgl

of coarse in python2(with a shift of 13) one can simply do "My Message".encode("rot13")

import string
shift_amt = 13
alphabet = string.ascii_lowercase
tab =string.maketrans(alphabet,alphabet[shift_amt:] + alphabet[:shift_amt])
print "ceaser salad is tasty".translate(tab)

Python strings have a translate method that applies a substitution cipher. There is also a function str.maketrans (string.maketrans in Python 2) that helps with building the translation table:

>>> from string import ascii_lowercase as alphabet
>>> shift = 13
>>> cipher = str.maketrans(alphabet, alphabet[shift:] + alphabet[:shift])
>>> print("caeser salad is tasty".translate(cipher))
pnrfre fnynq vf gnfgl

import string
shift_amt = 13
alphabet = string.ascii_lowercase
tab =string.maketrans(alphabet,alphabet[-shift_amt:] + alphabet[:shift_amt])
print "ceaser salad is tasty".translate(tab)

import string
shift_amt = 13
alphabet = string.ascii_lowercase
tab =string.maketrans(alphabet,alphabet[shift_amt:] + alphabet[:shift_amt])
print "ceaser salad is tasty".translate(tab)