alphabet='abcdefghijklmnopqrstuvwxyz' word_test='the cat sat on the map' def encrypt(text,num): output= ' ' for char in word_test: alpha_index = alphabet.find(char) def shift_amount(i): for i in alpha_index: shift_amnount= (alpha_index+num)%26 output= output + alphabet(alpha_index+shift_amount) return output

shift_amnount= (alpha_index+num)%26 1 output= output + alphabet(alpha_index+shift_amount) 2 I think you use wrong variable (1) shift_amnount and (2) shift_amount

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