Concurrency with streamlit

snehankekre · August 19, 2022, 8:49am

Hi @royassis, welcome to the Streamlit community!

Here’s a GitHub issue where the solution is discussed in the comments:

github.com/streamlit/streamlit

Improve "missing ReportContext" threading error

opened 08:15PM - 08 Apr 20 UTC

tconkling

enhancement

If you create a thread from your Streamlit script, and call streamlit functions …from within that thread, you need to attach a `ReportContext` to it or else your `st.foo()` calls won't do anything, and you'll get a warning message that looks something like this: “Thread ‘Thread-7’: missing ReportContext” We should improve the error message to tell the user how to fix this! (We may just want an FAQ entry that we can link to from the error message.) (The fix is to use `add_report_ctx` on the thread immediately after it's created:) ```python from streamlit.ReportThread import add_report_ctx thread = threading.Thread(target=...) add_report_ctx(thread) thread.start() ``` Related discussion: https://discuss.streamlit.io/t/how-to-run-a-subprocess-programs-using-thread-inside-streamlit/2440 (2022 edit: please see my comments [here](https://github.com/streamlit/streamlit/issues/1326#issuecomment-1024399877) - this is an internal Streamlit API and has some major caveats. In particular, please *do not* call `st.foo` commands from other threads - at least in production code that needs to be stable.)

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Concurrency with streamlit

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