Human: Can you show me a Python code to file size determination. Assistant: 
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.