Learn String Manipulation by Building a Cipher - Step 38

Python
1

Tell us what’s happening:

Please help me to explain the result of encrypted text print. I do not understand!
char: h encrypted text: k
char: e encrypted text: kh
char: l encrypted text: kho
char: l encrypted text: khoo
char: o encrypted text: khoor
char: encrypted text: khoorc
char: w encrypted text: khoorcz
char: o encrypted text: khoorczr
char: r encrypted text: khoorczru
char: l encrypted text: khoorczruo
char: d encrypted text: khoorczruog

Your code so far

text = 'Hello World'
shift = 3
alphabet = 'abcdefghijklmnopqrstuvwxyz'
encrypted_text = ''

# User Editable Region

for char in text.lower():
    index = alphabet.find(char)
    new_index = index + shift
    encrypted_text = encrypted_text + alphabet[new_index]
    print('char:', char, 'encrypted text:', encrypted_text)

# User Editable Region

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Challenge Information:

Learn String Manipulation by Building a Cipher - Step 38

2

Can you what about it that you do not understand?

3

Example: char: h encrypted text: k
We have:
The variable name declared encrypted_text = ’ ’
and in the loop body, encrypted_text = encrypted_text + alphabet[new_index]
The result shows char: h means that new_index = 7 + 3 = 10 → alphabet = k
Which number for encrypted_text = ’ ’ we should add to have the result of encrypted_text = k and so on?

4

That’s all correct

5

Yes. Then which number for encrypted_text = ’ ’ we should add to have the result of encrypted_text = k and so on? I don’t get that

6

Letters are added to encrypted_text, not numbers

7

Ahh, okay I understand now. Thanks :grinning_face: