我很困惑为什么返回函数在程序的控制台上打印一个值。 它不只是应该返回一个值吗？

Question

My program overloads the + operator to calculate the average GPA of 2 students. In my definition of the add function, I expect the return statement to return the average value. I then want to print this 'returned value' using print().

However, the return statement also seems to print the average value along with the print statement.

The output was:

8.0 
8.0

I don't understand why the return statement prints the value. Isn't is just supposed to return the value?

From googling this issue online, I found the only time when return should print a value is when an interactive console is being used (I am using pycharm).

prints twice

prints once

class student():

    def __init__(self, name, gpa):
        self.name = name
        self.gpa = gpa

    def __add__(x, y):
        return ((x.gpa + y.gpa)/2)

s1 = student("john", 9)
s2 = student("wick", 7)

avg = s1 + s2
print(s1 + s2)

Answer 1

It looks like in the first screenshot there is more source code when you scroll down. Check if a print exists there...