When I try to start the app from my streamlit commounity cloud, It can not succeed to render the application.
I got this error message from log:
Error: Streamlit requires raw Python (.py) files, but the provided file has no extension.
For more information, please see https://docs.streamlit.io
I tried to reboot the app but it still got error.
It can start normally in my local environment.
Please help me, thanks 
Hi @Helson, welcome to our community!
The error message you provided indicates that Streamlit Community Cloud expects a raw Python (.py) file to run the app.
Can you please double-check that the main file you’re trying to run with Streamlit has a .py extension? For instance, it should be named app.py or something similar.
Best,
Charly
Oh! Thank you Charly @Charly_Wargnier ! 
According to your answer, I found the problem!
The problem is that I have used the “first streamlit app.py” as my python file name, which might cause the scc(Streamlit community cloud) failed to identify my file extension.
So I changed it into “first_streamlit_app.py” and reconstructed my github repository and launched it again into my scc.
And the problem solved !
Thank you for your answer which gave me a right direction to solve this problem. I am still not very clear about the essence of this problem, but the main issue should be in my file naming.
Best,
Helson
Glad it sorted your issue!
Happy Streamlitin’! 
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