<human>:  file size determination.
<bot>: Here is a Python code to file size determination
import os

import sys

def get_file_size(filename):
  """
  Returns the size of a file in bytes.
  """
  return os.path.getsize(filename)

# Enter the file name
file_name = "test.txt"

# Calling the function
print((get_file_size(file_name)))

#Example Output
# 5

#Remember to inspect code for bugs.