gistfile1.txt

def buildCoder(shift): 
   dict_letters = {}
    for letter in string.ascii_letters:
        dict_letters[letter] = letter

    for letter in dict_letters:
        if (string.ascii_letters.find(letter) + shift) in range (0, 52):
            # 
            dict_letters[letter] = string.ascii_letters[(string.ascii_letters.find(letter) + shift) % 52]
        else:
            #
            print(str(string.ascii_letters.find(letter)))
            print('up: ' + str(string.ascii_letters.find(letter) + shift))
            dict_letters[letter] = string.ascii_letters[(string.ascii_letters.find(letter) + shift) - 26]
            
    return dict_letters