Why do we use empty parentheses here in python reference to book data science from scratch?

Question

Why do we use empty parentheses here in python?

My code is reference to book Data Science from scratch.

for user in users: user["friend"]=[]

In the above code Users is a list in which there are some dictionaries.

Answer 1

That means you want to create a list with no value inside. it is equivalent to user["friend"] = list()