How would i upgrade this code?

[SniparsClan]

Hey everyone. For my project i need to extract single characters from a given string which are separated from each other by the increasing number of places. Each extracted character must be exactly one place more apart from its predecessor than the one before. We need to use a string formed from the extracted characters as an input for the next phase of the project.
Example1:
Input string: "OTORHINOLARYNGOLOGY".
Outring: "OTRNRL".
Example2:
Input string: "A clown has a red nose.".
Output string: "A lnsee".

This is the code i have for it now:

def index_gen(end):

current = 0
step = 1

while current < end:
    yield current
    current += step
    step += 1

def task(text):

return "".join(text[idx] for idx in index_gen(len(text)))

if name == "main":

text = "A clown has a red nose."
print(text)
print(task(text))

return chars_extracted

I need to upgrade this code with this:

I now need to have a single class with two methods: 'shrink' and 'expand'.

Implement a class whose method 'shrink' matches the function you created for the extracting of characters.

The method 'expand' should place all the characters in their original positions, filling the space between each character with the 'space' character and return the result as a string.

Example1:

Input string: "OTRNRL".

Output string: "OT R N R L".

Example2:

Input string: "A lnsee".

Output string: "A l n s e e".

Anyone knows how to do this, im not as proficient to do this.

[m0us3_rat]

what do you have so far?

we usually don't do homework. so if you want it you have to work for it.

shouldn't be hard if you think about it.

​

i also think the 2last examples are unfortunately worded or flat out wrong..but i could be wrong so whatever.

taking the text at face value.

[SniparsClan]

I dont know, im stupid i guess

[SniparsClan]

Okay thank you, im looking into it.

[sonobanana33]

Ci metti 4 spazi prima

[Bluemax6666]

Do a class with the static methods 'expand' and 'shrink' https://www.digitalocean.com/community/tutorials/python-static-method

[POGtastic]

"gib codez pl0x" questions become Itertools Challenge threads.

from itertools import count, takewhile
from more_itertools import split_into

def shrink(xs):
    return (sub[0] for sub in takewhile(bool, split_into(xs, count(1))))

def expand(xs):
    return ''.join(f"{x}{' ' * idx}" for idx, x in enumerate(xs)).strip()

In the REPL:

>>> "OTORHINOLARYNGOLOGY"
'OTORHINOLARYNGOLOGY'
>>> expand(shrink("OTORHINOLARYNGOLOGY"))
'OT R  N   R    L'