Hi all 
This is a known issue: AttributeError: 'Deck' object has no attribute 'deck_widget' · Issue #5262 · streamlit/streamlit · GitHub
A fix was released last week and will be included in our next 1.13.0 release: Improve compatibility with pydeck v0.8.1 by sfc-gh-kbregula · Pull Request #5248 · streamlit/streamlit · GitHub
For now (before streamlit==1.13 is out), please install the previous pydeck version:
pip install pydeck==0.7.1
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