Python Run selection/Line In Python Terminal error - IndentationError: unexpected indent

[mdapri]

Environment data

• VS Code version: 1.28.1
• Extension version (available under the Extensions sidebar): 2018.9.0 (9 Oct 2018)
• OS and version: Windows 10 Enterprise
• Python version (& distribution if applicable, e.g. Anaconda): Python 3.6.2 (v3.6.2:5fd33b5, Jul 8 2017, 04:57:36) [MSC v.1900 64 bit (AMD64)] on win32.
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): Miniconda, conda 4.5.11
• Relevant/affected Python packages and their versions: NA

Actual behavior

Selecting the function definition in the code below (all the rows before v = add(1, 7))

def add(x, y):
    """Adds x to y"""
    # Some comment
    return x + y

v = add(1, 7)
print(v)

and running "Run Selection/Line in Python Terminal" [ / python.execSelectionInTerminal ] produces an error. Please note that there are no blank lines within function definition and there is a final blank line after the 'return x+y' statement

Expected behavior

The behavior is fine when saving the code above in a file "test_indent.py" and executing via command prompt
python test_indent.py
the result is
8

Steps to reproduce:

1. create a new file in Visual Studio code
2. Copy the code above
3. Select all the lines of function definition
4. "Run Selection/Line in Python Terminal" with right click option or Shift+Enter shortcut

Logs

Output for Python in the Terminal Window

>> def add(x, y):
...
  File "<stdin>", line 2

    ^
IndentationError: expected an indented block
>>>     """Adds x to y"""
  File "<stdin>", line 1
    """Adds x to y"""
    ^
IndentationError: unexpected indent
>>>
>>>     # Some comment
...
>>>     return x + y
  File "<stdin>", line 1
    return x + y
    ^
IndentationError: unexpected indent

[DonJayamanne]

Duplicate of #2857