Почему вывод 7?

Question

Я бросил вызов другому пользователю, и там была такая задача(см. ниже), вывод которой было число 7

x = 5
x, x = x + 1, x + 2
print(x)

Я не могу понять, почему ответом будет число 7?
Разве тут не используется одна переменная?

Answer 1

Sakshi, I don't think so. I move the code around and get a different result.
x = 5
x, x = x+2, x+1
print(x), and 6 is printed on screen

My theory is computer read code from left to right.
x, x + = x+2, x+1 will be translated to x, x = 7, 6
x first was reassigned to 7, and then reassigned to 6.

This problem is similar to another question few days ago.

https://www.sololearn.com/discuss/3244848/?ref=app
In that question if we follow "from left to right" method, we would expect [2, 3, 1, 4] as the result.
In that post I made a theory.
If a and b are being reassigned, and b is referencing a, a will get reassigned first, and b will reference to new a before reassign.
Now seeing this question make my theory not entirely correct. Now I got a new theory to that question.

Answer 2

x = 5
x,x = x+1, x+2

That means:
x,x = 5+1, 5+2 (which is 6 and 7)

And I think 7 is print because this is maximum number so, that's why is print

Answer 3

x, x = x+1, x+2 – это ни что иное как множественное присваивание.
То есть в конечном итоге мы присвоили x значение 7 и вывели на печать:
x = 5
x = 6
x = 7
print(x)

Другими словами это распаковка кортежа:
x, x = (6, 7) – скобки не обязательны

Вы можете проделать это с множеством переменных...😎