Type: Bug

Behaviour

When I use Python: Run Selection/Line in Python Terminal on code that
contains a triple-quoted string with a blank line “sandwiched” between two
non-blank lines, that blank line is removed in the version of the code that
gets executed in the REPL.

Running the same code as a normal script (python file.py) preserves the blank
line. So the behaviour of the code depends on whether it is run as a script or
via Run Selection/Line in Python Terminal, which should not happen.

This breaks code that relies on the exact newline structure of the string, such
as regex-based parsing of multi-line documentation blocks.

Steps to reproduce:

1. Create a new file, e.g. test_blank_line.py, with exactly this content:

    text = """line 1
    line 2
   
    line 4
    """
   
    print(repr(text))
   

   Note: there is a blank line between line 2 and line 4 inside the
   triple-quoted string.

2. Run the file normally in the integrated terminal:

    python test_blank_line.py
   

3. Observe the output:

    'line 1\nline 2\n\nline 4\n'
   

   There are two \n characters between line 2 and line 4, as expected.

4. Now select the entire code in test_blank_line.py and run:

   • Command Palette → Python: Run Selection/Line in Python Terminal, or
   • Right click → Run Selection/Line in Python Terminal.

5. Observe the output printed in the Python REPL in the integrated terminal:

    'line 1\nline 2\nline 4\n'
   

   The blank line between line 2 and line 4 is now missing (only a
   single \n remains). This shows that the text sent to the REPL by
   Run Selection/Line in Python Terminal does not faithfully match the text in
   the editor.

Diagnostic data

>>> text = """line 1
... line 2
... line 4
... """
>>>
>>> print(repr(text))
'line 1\nline 2\nline 4\n'
>>>

languageServer: "Pylance"

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