Always picks up ptvsd from extensions directory

[karthiknadig]

Environment data

• VS Code version: 1.27.1
• Extension version (available under the Extensions sidebar): master
• OS and version: windows
• Python version (& distribution if applicable, e.g. Anaconda): any
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
• Relevant/affected Python packages and their versions: XXX

Actual behavior

Setting PYTHONPATH has no effect while ptvsd.

Expected behavior

Should import ptvsd from current path first.

Steps to reproduce:

1. git clone https://github.com/Microsoft/ptvsd in C:\
2. In launch.json set "env": {"PYTHONPATH":"C:\\ptvsd"},
3. Use this test code:

import ptvsd
print(ptvsd.__file__)

3. Output should be: C:\ptvsd\ptvsd\__init__.py

Solution

Change ptvsd_launcher.py to append the extension path to sys.path instead of inserting.