Python For Loop explanation

I am new to python, can someone please explain to me why below code will loop for 5 rounds?I roughly guess it is because of this [i>=4 for i in ratings], but I still don't get it.

Code

def percentage_liked(ratings):    list_liked = [i>=4 for i in ratings]    print("-----")    percentage_liked = sum(list_liked)/len(list_liked)    return percentage_likedprint("******")print(percentage_liked([1, 2, 3, 4, 5, 4, 5, 1]))

Result

******-----0.5--------------------

Explanation on why it loop for 5 times