vscode debugging failure

Summary

Following the tutorial on https://awesome-streamlit.readthedocs.io/en/latest/vscode.html does not work. Streamlit apps can not be started with ptvsd.

Loading the browser on a streamlit app that has ptvsd enabled causes the following exception

ValueError: signal only works in main thread
File "/home/neuron/src/sch/streamlit-test/venv/lib/python3.6/site-packages/streamlit/ScriptRunner.py", line 311, in _run_script exec(code, module.__dict__)
File "/home/neuron/src/sch/streamlit-test/test.py", line 5, in <module> ptvsd.enable_attach(address=('localhost', 5678), redirect_output=True)
File "/home/neuron/src/sch/streamlit-test/venv/lib/python3.6/site-packages/ptvsd/attach_server.py", line 101, in enable_attach ptvsd_enable_attach(address)
File "/home/neuron/src/sch/streamlit-test/venv/lib/python3.6/site-packages/ptvsd/_remote.py", line 64, in enable_attach **kwargs)
File "/home/neuron/src/sch/streamlit-test/venv/lib/python3.6/site-packages/ptvsd/pydevd_hooks.py", line 128, in install daemon = Daemon(**kwargs)
File "/home/neuron/src/sch/streamlit-test/venv/lib/python3.6/site-packages/ptvsd/daemon.py", line 503, in __init__ super(Daemon, self).__init__(wait_for_user, **kwargs)
File "/home/neuron/src/sch/streamlit-test/venv/lib/python3.6/site-packages/ptvsd/daemon.py", line 100, in __init__ self._install_exit_handlers()
File "/home/neuron/src/sch/streamlit-test/venv/lib/python3.6/site-packages/ptvsd/daemon.py", line 425, in _install_exit_handlers self._exithandlers.install()
File "/home/neuron/src/sch/streamlit-test/venv/lib/python3.6/site-packages/ptvsd/exit_handlers.py", line 62, in install self._install_signal_handler()
File "/home/neuron/src/sch/streamlit-test/venv/lib/python3.6/site-packages/ptvsd/exit_handlers.py", line 103, in _install_signal_handler orig[sig] = signal.signal(sig, self._signal_handler)
File "/usr/lib/python3.6/signal.py", line 47, in signal handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))

This is the script that can reproduce the issue:

#!/usr/bin/python3
import streamlit as st

import ptvsd
ptvsd.enable_attach(address=('localhost', 5678), redirect_output=True)
ptvsd.wait_for_attach()
print("PTSVD listening on localhost:5678")

Debug info

• Streamlit version: Streamlit, version 0.49.0
• Python version: Python 3.6.8
• virtualenv
• OS version: ubuntu 18.04.3 LTS
• Browser version: Chrome Version 78.0.3904.70 (Official Build) (64-bit)

[tconkling]

Hey @andaag -

I don’t think we’ve tested Streamlit with ptvsd, so I can’t comment on that particular plugin. (The awesome-streamlit project is created by an (awesome!) Streamlit community member, so the doc you’re following doesn’t come from us.)

I use PyCharm for all my Python debugging, so I’m not a VScode expert, but I was able to get a Streamlit debugging session working without any third-party plugins.

I edited my project’s launch.json file (see here for more details on creating that file), and added a new launch configuration:

{
    "name": "Streamlit: Current File (Integrated Terminal)",
    "type": "python",
    "request": "launch",
    "program": "/Users/tim/.local/share/virtualenvs/lib-CDRh8goq/bin/streamlit",
    "args": [
        "run",
        "${file}"
    ],
    "console": "integratedTerminal"
},

The “program” argument here is the path to bin/streamlit within my local virtual environment, so you’ll need to replace it with the correct path for your setup.

The “args” values here are just telling VScode to run streamlit run ${file}, where ${file} gets replaced with the currently active VScode file.

[anthonymobile]

also on OSX (M1) with python 10.1 and