How to create a clipboard sycle through program?

Question

I want to create a Clipboard "recorder". This is the first step and I have already run into an issue. THis code looks perfectly fine but it returns only a but not b when copying a new word.

from pyperclip import *
from time import *

a = paste()
def b():
    sleep(0.1)
    b = paste()
    print(b)
b()
print(a)

I'm confused and kind of a beginner so pls help.