<human>:  Give me a Python function to test if a binary file is a binary.
<bot>: Here is a Python function to test if a binary file is a binary

import os

def is_binary(filename):
  """
  Test if a file is a binary file.
  """
  return filename.endswith('.bin')

# Enter the filename
filename = "myfile.txt"

# Calling the function
print((is_binary(filename)))

#Example Output
# False

#Remember to inspect code for bugs.