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ROT-N variable-offset substitution encipher for Python3 (to decipher, enter negative offset)
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| from string import ascii_lowercase | |
| def rot_n(in_string, n=13): | |
| "returns copy of in_string shifted alphabetically by given offset N" | |
| n %= len(ascii_lowercase) | |
| char_shifts = ascii_lowercase[n:] + ascii_lowercase[:n] | |
| out_string = '' | |
| for char in in_string: | |
| if not char.isalpha(): | |
| out_string += char | |
| continue | |
| new_char = char_shifts[ascii_lowercase.find(char.lower())] | |
| out_string += new_char.upper() if char.isupper() else new_char | |
| return out_string | |
| if __name__ == '__main__': | |
| # for Python2 compat use raw_input instead | |
| in_string = input('String to shift: ') | |
| offset = int(input('Offset to shift string by (default 13): ') or 13) | |
| print(rot_n(in_string, offset)) |
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