How do i...set the alphabet in my programm

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Hi , i need help for large strings.The output is not correct. It needs to be in a alphabet.

What I have tried:

Python

s = input("enter a string here: ")
shift = int(input("enter a value here: "))
n = len(s)
output = []
i = 0
output = [(chr(ord(s[i])+(i+1)+shift)) for i in range(n)]
print(output)

Posted 15-Nov-20 4:51am

Hadok en

Updated 15-Nov-20 7:38am

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Richard MacCutchan 15-Nov-20 11:05am

"The output is not correct."
What does it look like and why is it not correct?

Patrice T 15-Nov-20 12:49pm

Show sample input with actual and expected output !

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CPallini · Answer 1 · 2020-11-15T05:14:00

Quote:
for large strings.The output is not correct

Of course, it is not. You are adding the index i to the character code in order to obtain a new character code, but i, for large strings is, well..., large.
So, if you really need to add i the you have to 'put back' the character code in the allowed range (e.g. 'a',..,'z'). You need the modulo operator % for such a job.

OriginalGriff · Answer 2 · 2020-11-15T05:26:00

Carlo is right, but his suggestion doesn't go far enough.
If you need a string to be "in an alphabet" - by which you mean that the result should contain only the alphabetic characters a to z, A to Z, space, and some punctuation, then you need to be rather more clever than your existing code.

Character sets do not contain just alphabetic characters - the smallest character set is seven bits wide, and contains 128 characters (Basic ASCII), more normal usage is Extended ASCII with eight bits for 256 characters, and most systems these days use Unicode, which can contain between 8 and 32 bits per character for a truly monumental number of potential characters!

If you want to restrict input and output to a specific subset of any available character set then you need to create an array holding each valid character a, b, c, d, ... z, A, B, C, ... +, -, ?, space, 1, 2, 3, ... 0, !, ", ', ... and so on.
Then look up each character in the input in that array, get it's index, and modify that by adding your loop guard and shift values. Then use the modulus operator "%" to bring the range of values back within the scope of the array, and fetch the output character from there.

It sounds complicated, but it really isn't: try it on paper and you'll see what I mean!
Give it a try ... it's really pretty easy once you get your head around it.

Hadok en · Answer 3 · 2020-11-15T07:38:00

Python

def encrypt(cäsar):
    shiftValue=int(input("enter a shift value"))
    string=len(cäsar)
    for i in cäsar: 
        if i.isupper():  
            print(chr((ord(i)+(i+1)+shiftValue-65)%26+65),end="") 
        else:
            print(chr((ord(i)+(i+1)+shiftValue-97)%26+97),end="") 
            
enter=input("enter a string ")
encrypt(enter)

TypeError: can only concatenate str (not "int") to str

I get all the time that error. Do i need to convert the 65 and 97 to strings?

How do i...set the alphabet in my programm

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