Ytukyg

def key(shift):

    data = 

    string = input("Please enter the string you wish to decode.n")

    for i in string:

        if i.strip() and i in ALPHABET:

            data.append(ALPHABET[(ALPHABET.index(i) - shift) % 26])

        else:

            data.append(i)

    output = ''.join(data)

    return output



def run():



    data = 

    count = 0

    shift = 0

    for shift in range (26):

        count +=1

        if key(shift) == "hello world":

            print("Decoded.")

        else:

            print("Not this time!")

        print(count)

        print(key(shift))

When I run my program, it should execute "Decoded" at count 3, since it takes 3 shifts to decode khoor zruog into hello world. Moreover, the input "Please enter the string you wish to decode" should be printed once, rather than so many times.

Please enter the string you wish to decode.

khoor zruog

Not this time!

1

Please enter the string you wish to decode.

khoor zruog

khoor zruog

Please enter the string you wish to decode.

khoor zruog

Not this time!

2

Please enter the string you wish to decode.

khoor zruog

jgnnq yqtnf

Please enter the string you wish to decode.

khoor zruog

Not this time!

3

Please enter the string you wish to decode.

khoor zruog

ifmmp xpsme

Please enter the string you wish to decode.

khoor zruog

Decoded.

4

Please enter the string you wish to decode.

khoor zruog

hello world

Please enter the string you wish to decode.

This is what happens when I try to execute the code. I don't know why it is incrementing to 0, and I don't know why it is asking me the input so many times. Can anyone help me please?

EDIT:

def key(shift,string):

    data = 

    for i in string:

        if i.strip() and i in ALPHABET:

            data.append(ALPHABET[(ALPHABET.index(i) - shift) % 26])

        else:

            data.append(i)

    output = ''.join(data)

    return output



def run():

    data = 

    string = input("Please enter the string you wish to decode.n")

    plaintext = input("Please enter plaintext word.n")

    count = 0

    shift = 1

    for shift in range (26):

        count +=1

        if plaintext in key(shift,string):

            print(key(shift,string))

            print("The key is: ", count)

            print("Decoded.")

            break

        else:

            print(key(shift,string))

            print("Not this time!")

        print(count)

your string

string = input("Please enter the string you wish to decode.n")

is inside the function which is called inside the for loop. that's why you are getting print statement multiple times!

remove that input statement and your decoded problem will get solved.