human
property change event.
assistant
Here is a Python function to property change event

import time

def _property_change_event(obj, prop, old_val, new_val):
  """
  :param obj: object
  :param prop: property name
  :param old_val: old value
  :param new_val: new value
  :return:
  """
  print(("Property change event: %s, %s, %s, %s" % (obj, prop, old_val, new_val)))

# Enter the object
obj = "obj"

# Enter the property
prop = "prop"

# Enter the old value
old_val = "old_val"

# Enter the new value
new_val = "new_val"

# Calling the function
print((_property_change_event(obj, prop, old_val, new_val)))

#Example Output
# Property change event: obj, prop, old_val, new_val
# None

#Remember to inspect code for bugs.