Simonsblog

Rotate arbitrary

Another way to rotate by arbitrary values.

You can in python 2.x - just str.encode(“rot13”) - but for other rotations you could use the following (for ascii):

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

letters = uc + lc
rotate = 17 # ROT17
rot = "".join((x[:rotate][::-1] + x[rotate:][::-1])[::-1] for x in (uc,lc))


def rot_func(text, encode=True):
    src, trg = (letters, rot) if encode else (rot, letters)
    trans = maketrans(src, trg)
    return text.translate(trans)

text = "Text to ROT{}".format(rotate)
encode = rot_func(text)
decode = rot_func(encode, False)

print("""
Rotate:\t{rotate}
Rot:\t{rot}
Text:\t{text}
Encode:\t{encode}
Decode:\t{decode}
""".format(**locals()))

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