Rot*

rot-example.py

from string import ascii_uppercase as uc, ascii_lowercase as lc, maketrans


def rot_func(text, encode=True, rotate=13):
    letters = uc + lc
    rot = "".join((x[:rotate][::-1] + x[rotate:][::-1])[::-1] for x in (uc,lc))
    src, trg = (letters, rot) if encode else (rot, letters)
    trans = maketrans(src, trg)
    return text.translate(trans)

text = "Text to ROT"
encoded = rot_func(text)
decoded = rot_func(encoded, encode=False)

print("""
Text:\t{text}
Encode:\t{encoded}
Decode:\t{decoded}
""".format(**locals()))

For python 2.x if you wanted a different rotate than 13 - str.encode("rot13")