Can someone explain the logic or syntax of
function()()
or
function(function)()
An example: I can't seem to grasp the idea of how this actually works
func2(func1)("bye")
def func2(fn):
print("func2")
def func3(text2):
print("func3")
print(text2)
return func3
def func1():
print("func1")
func2(func1)("bye")
Output:
func2
func3
bye
A function can return another function. The first call, calls the first function and the second calls the function returned by the first.
The nested definitions are a separate concept not related to the question (about functions returning functions), since func3 exists only on the scope of func2, which may create confusion.
Here is a simpler example:
def f1(a):
print("Function f1 called")
print(a)
def f2(b):
print("Function f2 called")
print(b)
return f1
f2(1)(2)
Function f2 called
1
Function f1 called
2
