What if there are more than one parenthesis behind the function in Python?

Generally, calling a function is a parenthesis. If you see a parenthesis followed by a parenthesis, the first function returns a function, and if there are parentheses, the previous one also returns a function. And so on

Like Fun () ()

def Fun ():    print ("It's fun");    Def _fun ():        print ("This is_fun");     return _fun;

Your task is to write a higher order function for chaining together a list of unary functions. In other words, it should return a function that does a left fold on the given functions.
Chained ([a,b,c,d]) (input)

Should yield the same result as

D (c (b (A (input))))

def fun81 (functions):    def f (x):        for in  functions:            = Fun (x);         return x;     return F;

Summary: Python can also chain points with functions, but functions need to return a function.

What if there are more than one parenthesis behind the function in Python?