Human: Give me a Python code to request check if file exists. Assistant: 
Here is a Python code to request check if a file exists

import os

def check_file(file_name):
    """
    Check if file exists.
    """
    if os.path.isfile(file_name):
        return True
    else:
        return False

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

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

#Example Output
# True

#Remember to inspect code for bugs.