Environment data

• VS Code version: 1.27.1
• Extension version (available under the Extensions sidebar): 2018.8.0
• OS and version: Windows 7
• Python version (& distribution if applicable, e.g. Anaconda): Anaconda 5.2

Actual behavior

When I debug a python file in vscode my PYTHONPATH variable is overridden.

here is the relevant line shown on the terminal.

set "PYTHONPATH=c:\Users\username.vscode\extensions\ms-python.python-2018.8.0\pythonFiles\experimental\ptvsd"

Expected behavior

I would expect the PYTHONPATH to be appended to not overridden.

Steps to reproduce:

1. Set the PYTHONPATH variable to something
2. debug a script with the follow code:

import sys
print(sys.path)

You should not see the path that you set in the PYTHONPATH