Calculate

Question

Why I put 1+1, but there is no output?

Answer 1

If you are using the Python shell, e.g. in IDLE, then you will see the prompt:
>>>
If you type 1+1 and hit enter, you will get 2:
>>>1+1
2
However if you are typing a code that has to be "run", e.g. in the Code Playground, there is no >>> prompt and you have to enter commands such as print() to get an output on the screen.

Answer 2

Because you have not outputted the value somewhere, or even stored it.
print(1+1) will help you see your result