import string

uc = string.ascii_uppercase
lc = string.ascii_lowercase

myrot = uc + lc

drot = {}

for i in range(26*2):
    b = (i + 13)%26
    idx = b if i < 26 else b + 26
    drot[myrot[i]] = myrot[idx]

def rot13(mystr):
    newstr = "".join([drot[c] if c in drot else c for c in mystr])
    return newstr

print(rot13("Rai is such a cute latino girl"))


rot13char = lambda c: chr((((ord(c) & 0b11111) + 12) % 26 + 1)+(ord(c) & 0b1100000))

def bitrot13(mystr):
    newstr = "".join([rot13char(c) if c in myrot else c for c in mystr])
    return newstr

teststr = '''
>>> import timeit>>> timeit.timeit('"-".join(str(n) for n in range(100))', number=10000)0.8187260627746582>>> timeit.timeit('"-".join([str(n) for n in range(100)])', number=10000)0.7288308143615723>>> timeit.timeit('"-".join(map(str, range(100)))', number=10000)0.5858950614929199Note however that timeit will automatically determine the number of repetitions only when the command-line interface is used. In the Examples section you can find more advanced examples.
'''



if __name__ == '__main__':
    import timeit
    print("Pella version")
    print(timeit.timeit("rot13(teststr)", setup="from __main__ import rot13, teststr", number= 1000))

    print("Bit version")
    print(timeit.timeit("bitrot13(teststr)", setup="from __main__ import bitrot13, teststr", number= 1000))