Good morning, @m.iravani.
In Python, indentation is critical to the meaning of the code. Since we cannot see your code’s indentation, we can’t be sure exactly what your code is expected to do.
So that we can see your indentation, when you post your code here, please put ``` (NOT ''' !), on a line by itself, both before and after your code. Then we should be able to see what your code actually looks like.
On my keyboard, the ` symbol is to the left of the 1 key in the top row. This is distinct from the ’ symbol, which is next to the Enter key.