Can someone explain rot13 in python?

Question

It's bugging me for days..

def rot_13():
encoding={}
abc='abcdefghijklmnopqrstuvwxyzabcdefghijklm'
ABC='ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLM'
for i in range(0,26):
encoding.update({abc[i] : abc[i+13]})
encoding.update({ABC[i] : ABC[i+13]})
return encoding

print(rot_13())

def decode(s):
key = rot_13()
sentence = []
for i in range(0, len(s)):
if key.get(s[i], 'none') != 'none':
sentence.append(key[s[i]])
else:
sentence.append(s[i])
new_sentence = ''.join(sentence)
return new_sentence

print(rot_13('V NZ YRNEAVAT CLGUBA JVGU FUR PBQRF NPNQRZL!'))
https://code.sololearn.com/c3rA9QJWSEse/?ref=app
https://code.sololearn.com/c3rA9QJWSEse/?ref=app

Answer 1

NOT
print(decode(rot_13('V NZ YRNEAVAT CLGUBA JVGU FUR PBQRF NPNQRZL!')))

BUT INSTEAD
print(decode('V NZ YRNEAVAT CLGUBA JVGU FUR PBQRF NPNQRZL!'))

Answer 2

Which part would you like us to explain?

People are more likely to inspect your code if you put it in a script on sololearn playground instead of pasting it into the description:
– Go to Code section, click +, select the programming language, insert your code, save.
– Come back to this thread, click +, Insert Code, sort for My Code Bits, select your code.
This way, it is easier to read and everyone can test it!

ROT13:
https://en.m.wikipedia.org/wiki/ROT13

Answer 3

Hi, Liat123 !

I made a demo to explain rot13 for you. You can look at it here:

https://code.sololearn.com/czp5Fq09D4N4/?ref=app

Answer 4

#The first function could be omitted entirely.
#r13 does encoding and decoding by offsetting the letters by 13 chars

abc='abcdefghijklmnopqrstuvwxyzabcdefghijklm'
ABC='ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLM'
encoding = {} #<--This is the key✔️
#create the encoding dictionary
for i in range(0,26):
encoding.update({abc[i] : abc[i+13]})
encoding.update({ABC[i] : ABC[i+13]})

#print(encoding)

#encoder/decoder
def r13(s):
key = encoding #<--key used here👈
sentence = []
for i in range(0, len(s)):
if key.get(s[i], 'none') != 'none':
sentence.append(key[s[i]])
else:
sentence.append(s[i])
new_sentence = ''.join(sentence)
return new_sentence

print(r13('I AM LEARNING PYTHON WITH SHE CODES ACADEMY!'))

print(r13('V NZ YRNEAVAT CLGUBA JVGU FUR PBQRF NPNQRZL!'))

print(r13('it is a simple Encoding trick'))

print(r13('vg vf n fvzcyr Rapbqvat gevpx'))

Answer 5

It looks like a function that takes whatever letter from the "encoded message" and adds 13 to it to output the correct "decoded message".

Answer 6

Thanks everyone, I inserted the code to the post.
I understood the general idea of the question but the last print didn't run. The question has a dictionary and the letters make sense but something seems off.

Answer 7

rot13() does not take any argument. Could it be that you mean

print(decode('V NZ YRNEAVAT CLGUBA JVGU FUR PBQRF NPNQRZL!'))

In the last line your code?

Answer 8

Tried that now, still the same error

Answer 9

Yay it worked! :D thanks for everyone!

Is it ok to post in sololearn 5 posts a day? Or can I insert couple of codes in one post?
Don't want to spam but could really use some help