Human: how to see if a file exists. Assistant: 
Here is a Python program to see if a file exists

import os

def _file_exists(path, filename):
  """Checks if the filename exists under the path."""
  return os.path.isfile(os.path.join(path, filename))

# Enter the path
path = "/home/dahlia/Desktop/python_code"

# Enter the filename
filename = "test.txt"

# Calling the function
if _file_exists(path, filename):
  print("File exists")
else:
  print("File does not exist")

#Example Output
# File does not exist

#Remember to inspect code for bugs.