<human>:  speicify directory for output file.
<bot>: Here is a Python function to speicify directory for output file

import os

def _specify_output_dir(output_dir):
  """Specify directory for output file."""
  if not os.path.exists(output_dir):
    os.makedirs(output_dir)

# Enter the output directory
output_dir = '/Users/rosey/Desktop/output'

# Calling the function
print((_specify_output_dir(output_dir)))

#Example Output
# None

#Remember to inspect code for bugs.