To validate:

ensure prerequisites:
a. in DebugAdapterDescriptorFactory experiment ("DebugAdapterFactory - experiment")
b. in DebugAdapterNewPtvsd experiment ('"PtvsdWheels37 - experiment"')
c. if building from source, run gulp installNewPtvsd, if that isn't working, do it manually (from the repo root):
1. python -m pip --disable-pip-version-check install -t ./pythonFiles/lib/python/new_ptvsd/no_wheels --no-cache-dir --implementation py --no-deps --upgrade ptvsd==5.0.0a8
2. python -m pip --disable-pip-version-check install -t ./pythonFiles/lib/python/new_ptvsd/wheels --no-cache-dir --no-deps --upgrade ptvsd==5.0.0a8
in a new workspace folder add "script.py" with the following code (an infinite loop):

import time

while True:
     print("Hello")
     time.sleep(1)

add ".vscode/launch.json":

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Attach to Process",
            "type": "python",
            "request": "attach",
            "processId": 7499,
            "pathMappings": [
                {
                    "localRoot": "${workspaceFolder}",
                    "remoteRoot": "."
                }
            ]
        }
    ]
}

in a terminal, run python script.py
verify that "Hello" gets periodically printed in the debug console
start a debug session using the "Attach to Process" config
verify that it connects (e.g. no error, breakpoints work)

⚠️ If there's a debugger timeout then it's most likely a ptvsd issue. In that case (or for more info in any case), adjust the above steps as follows:

add "logToFile": true to the above "attach" config
for step 3 run with the following environment variables:
- PTVSD_DEBUG=True
- PTVSD_DEBUG_FILE=…/pydevd.log
- e.g. PTVSD_DEBUG=True PTVSD_DEBUG_FILE=…/pydevd.log python script.py
(new) step 7: send that log file to the ptvsd team

Attach to local process - launch.json experience #8384

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