[Python] Shift+Enter in VS Code Python does not run selected lines

I'm following this tutorial on how to run selected lines in VS Code Python. I highlighted the following code:

x = [1,2,3,4,5]
x[2:3]


and pressed Shift+Enter, but the code is just shown in the Python terminal instead of executing and returning the result.

Here is what happens in my terminal:

(base) PS D:\stock> C:/Users/shadowpioneer/anaconda3/Scripts/activate
(base) PS D:\stock> conda activate base
(base) PS D:\stock> & C:/Users/shadowpioneer/anaconda3/python.exe
Python 3.13.5 | packaged by Anaconda, Inc. | ...
>>>


Then when I press Shift+Enter again, the code is simply repeated:

>>> x = [1,2,3,4,5]
... x[2:3]
...


It seems like VS Code is just sending the code to the Python REPL but not executing it.

1. 
   I have installed the Python extension and Jupyter extension in VS Code.
   
   
2. 
   I have selected the correct Anaconda Python interpreter.
   
   
3. 
   I am using a .py file (not a notebook).
   

How can I configure VS Code so that Shift+Enter executes selected Python code and shows the output?

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