[Python] Python, Return from subroutine, using tkinter progress bar

I am writing a script that uses tkinter progress bar that tracks the number of files done.

I have a list of files that I want to process, each file would be processed in the subroutine.

In the subroutine I need to check each line in the file.

My subroutine (my_sub_routine(k)) never returns.

from tkinter import *
from tkinter.ttk import *

def my_sub_routine(k):
p = 0
def test_read(p):
print("reading line number",p,",number of lines to read = ",k)
if p < k:
p += 1
test_read(p)

if p == k:
print("should be gone")
return None
test_read(p)

def main():
GB = 15 # this would be number of file to process
root = Tk()
root.title("Progress Window")
root.geometry("300x300")
progress = Progressbar(root, orient=HORIZONTAL, length=200 , maximum=GB)
progress.pack()
i = 0
def my_func(i):
i += 1
progress['value'] = i
print("i: ",i)
root.after(1000, my_sub_routine,10) #this would be a filename with 10 lines in it.
if i == GB:
quit()
my_func(i)
mainloop()

if __name__ == '__main__':
main()

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