How to solve this one?

Question

Currently trying to do this task, but can't really do it. Basically, there is a file with numbers, separated with spaces. I need to add full cubes into this list, and then not full cubes. Then I also need to print path, time of creation and how many memory takes (this part is solved)
Code :
f_name = input('Введіть назву файлу: ')
import os
def fullcube(n):
n = f_name.read()
x = int(n)**(1/3)
x = int(round(x))
if x**3 == n:
return(n)
def notfullcube(n):
n = f_name.read()
y = (n)**(1/3)
y = int(round(y))
if y**3 != n:
return(n)
file = open(f_name, 'r')
f = file.read()
file.close()
cubef = list(map(fullcube(n), f.split()))
ncubef = list(map(notfullcube(n), cubef))
fi = open(f_name, 'a')
while ch < len(cubef):
fi.write('\n'+(str(cubef[ch])+'')*int(ncubef[ch]))
fi.close()
print(os.path.abspath(f_name))
print(os.path.getctime(f_name))
print(os.path.getsize(f_name))

Answer 1

"while ch < len(cubef):
fi.write('\n'+(str(cubef[ch])+'')*int(ncubef[ch]))"

what is "ch"?
I can't see where you've declared it and your not incrementing it.

Answer 2

It's kind of redundant, I forgot to remove it