Why python need parentheses in function call? [closed]

Answer 1

The parentheses allow us to disambiguate the function object, func, from the calling of the function, func().

Function objects are first-class objects in Python. You can, for instance, pass them as arguments to functions, just like any other object. This is often used to set a callback function -- a common practice in GUI programming or concurrent programming.

Answer 2

In python you can refer to the function itself, without running it. It is useful to define callbacks for instance.

So you need paranthesis to differentiate between a function call (you run it an consider its result) versus just refering to this function (without running it).