Caesar Cipher

easypy_strings

Implement caesar_encrypt(message, n).

Shift every English letter n places along the alphabet, wrapping around and preserving case; leave non-letters unchanged. For example caesar_encrypt("XYZ", 5) == "CDE". The shift may be negative or larger than 26 (n and n % 26 behave the same), so a shift of 0, 26, or -26 returns the text unchanged.

Your solution

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Hints

Hint 1

Map each letter to 0..25 with ord(ch) - ord('a'), add the shift mod 26, map back with chr.

Hint 2

Handle upper- and lower-case separately; pass other characters through unchanged.