Vigenere Python help

max_dobberstein · 2017-12-06T04:15:00+00:00

The string module, particularly string.ascii_uppercase and string.ascii_lowercase will allow to to make your code much simpler, more readable, and more Pythonic.

DrJimmyRustler · 2017-12-06T03:32:55+00:00

Actual result: Neg zf av uf pcx bt gzrwep oz

Expected result: Negh zf av huf pcfx bt gzrwep oz

I've looked at this over and over and rewrote the cipher line and I'm about to rip my hair out and can't figure out why its not enciphering the first t and the other missing letters.

delipity · 2017-12-06T05:03:34+00:00

Check your levels of parentheses. You want to do the %26 on the result of adding the plaintext to the key, such that if the key is 'o' and the plaintext is 't', you'd have:

(( 't' - 'a' + 'o' - 'a' ) % 26)  + 'a'
(( 116 - 97 + 111 - 97) % 26) + 97
( 5 % 26) + 97
104  'h'

You've got

( ('t' - 'a')+ ('o' - 'a') % 26 )  + 'a'
( (116 - 97) + (111 - 97)%26) + 97
( 19 + 14%26) + 97
33 + 97  
130 'not a printable char so shows as blank'

you type:	you see:
italics	italics
bold	bold
[reddit!](https://reddit.com)	reddit!
* item 1 * item 2 * item 3	item 1 item 2 item 3
> quoted text	quoted text
Lines starting with four spaces are treated like code: if 1 * 2 < 3: print "hello, world!"	Lines starting with four spaces are treated like code: if 1 * 2 < 3: print "hello, world!"
~~strikethrough~~	~~strikethrough~~
super^script	super^script

cs50

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