@st.cache_resource matplotlib figure vanishes after rerun

Using Streamlit
,
1

Summary

Using the code below, the matplotlib fig vanishes every time streamlit reruns if I leave the parameter the same.
If I change the parameter of the fig, it shows up again.

The function is inside a class.

Steps to reproduce

Code snippet:

class FigureView:
    #some code

    @st.cache_resource
    def risk_analysis_1_dot(_self, probability:str, impact:str, title:str):
        #some code
        return plt

If applicable, please provide the steps we should take to reproduce the error or specified behavior.

Expected behavior:
Fig matplotlib fig shows even if parameter were not chanched

Actual behavior:
.matplotlib fig vanishes if other values get updated but not matplotlib fig input data

Debug info

  • Streamlit version: streamlit==1.21.0
  • Python version: 3.10
  • Using local venv
2

That code is syntactically incorrect even if you put actual code in place of the comments.

3

Are you passing the returned plt to st.pyplot, outside of the function? Or, are you using st.pyplot inside of the risk_analysis_1_dot? If the former, it should work fine. If the latter, it will only show the output the first time you run the code.

4

After your edit I was able to add some code to your class and use it to plot something, but I couldn’t reproduce the issue, the plot never vanishes.

5

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