streamlit hello raises exception

Summary

Type here a clear and concise description of the bug. Aim for 2-3 sentences.

Steps to reproduce

docker run -it -p 8501:8501 ubuntu:19.04 bash

Then in the container, run:

apt-get update
apt-get install python python-pip build-essential
pip install streamlit
streamlit hello

then pick the 2nd demo

Expected behavior:

No exception raised

Actual behavior:

Exception raised

Is this a regression?

not sure

Debug info

• Streamlit version: (get it with $ streamlit version)
• Python version: python2.7
• Using Conda? no
• OS version: Ubuntu Linux
• Browser version:

Additional information

If needed, add any other context about the problem here.

[monchier]

It seems there is an issue with configparser that is installed by apt-get. This only happen for Python 2.7. A possible workaround is to remove configparser via apt-get before pip install streamlit:

apt-get update
apt-get install python python-pip 
apt-get remove python-configparser
pip install streamlit
streamlit hello

This will take care of the bug.

Another solution is to use a different python image. For example for Python-2.7: python:2.7-slim does not have this problem, likely because python is preinstalled and the apt-get does not conflict with pip.

@jakevdp this will probably work for altair as well.

---

At this point, we’re at a loss how to automatically fix this for users. But it seems very localized to the specific Docker image, and specifically on Python 2.x — and we have the work-around above. So we’ll stop work on this at the moment.

If anyone has a solution, please let us know. We’ll be happy to merge it in!

[monchier]

This is a Python2 only bug. I think we should close it.