<human>:  Write me a Python function to determine existence.
<bot>: Here is a Python function to determine existence

import os

def is_pid_exist(pid):
  """
  Determine whether the pid exists or not.
  :param pid: pid
  :return: True or False
  """
  return os.path.exists(pid)

# Enter the pid
pid = "/home/rosey/Desktop/test.pid"

# Calling the function
print((is_pid_exist(pid)))

#Example Output
# False

#Remember to inspect code for bugs.