Source: 📖 Effective Python item 65

finally Blocks

finally blocks will always run after try blocks, whether an exception was raised in the process or not. In the absence of an except block to handle exceptions, any code within the finally block will run before the exception is propagated up to the calling code.

try:
	division = 10 / 5
	print(division)
finally:
	print("this runs")
	
>>>
2
this runs

try:
	causes_error = 10 / 0
	print(causes_error)
finally:
	print("this still runs")
	
>>>
this still runs
Traceback ...