Why is an object not created when a method is called during the object's contruction?

Question

Given the class test , why it is not possible to instantiate it by calling one of its methods along with the constructor?

class test:
    def __init__(self, a):
        self.a = a

    def print_a(self):
        print(self.a)

Here is an example:

>>> obj = test("Hello").print_a()  # Prints the desired output.
Hello
>>> obj
>>> print(obj)  # But the object does not exist.
None
>>> obj = test("Hello")  # It obviously works when doing it separately. 
>>> obj
<__main__.test object at 0x7f537fea3940>
>>> obj.print_a()
Hello

Why is it not possible to chain a method call with the constructor call?

This was implemented in python3 .

Answer 1

You are assigning obj to the return value of the function print_a (which is None as it has no return). The actual test object was never stored and is therefore no longer in scope when you try to print it.