Conclusion

• This is a function that is called by another function, rather than being called directly.
• A function is passed as a parameter, and the received function is called and used.

Example)

def callback_func(func):
	for i in range(5):
    	func(i)
        
def print_hello(num):
	print('hello', num)
    
callback_func(print_hello)

References https://coding-yesung.tistory.com/20