Waiting and looping function

[J_S]

Hi all,

I am using Streamlit in docker. I had one function that is a while loop and does something and waits for 1 second.

while condition=True:
check something
do something
update condition
st.write(doing something)
time.sleep

I saw that streamlit does not prints st.write again and again in this scenario in the UI. I can see the activity happening in the logs but just the UI st.write message is not updated.

Can you tell any spefific pattern I need to use to make it work?

[Goyo]

FWIW it seems to work for me in streamlit cloud.

[J_S]

Thanks, is there any pattern to capture print() output?

[Goyo]

I am not sure I understand you, this seems unrelated to the OP:

print() writes to sys.stdout unless a file argument is provided.

[J_S]

Sorry, I should have asked it clearly.

The function I am calling is using Python log library and those messages are lost and dont disaplay on the Streamlit UI.

Is this the best pattern to grab logging output into st.write

Redirecting logger output to a streamlit widget

Hey @david-waterworth From what you’ve described, it seems like your main objective is to display logs from task.py in your app as they’re generated. What you’ve tried involves redirecting stdout, which is a common strategy for capturing print statements. But it won’t work for capturing log messages directly, as Python’s logging module doesn’t use stdout by default for its output. Since Streamlit’s loggers don’t write to stdout (the loggers are set up with a StreamHandler that writes t…

[Goyo]

I don’t really understand the problem you are trying to solve, thus I don’t know whether the linked post can solve it or not.

“The function I am calling is using Python log library and those messages are lost” sounds like something is terribly wrong, but I am probably misunderstanding it.