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It seems that I cannot use super() in a class declaration inside a cached function.
I am trying to use an object that requires import taking a long time, I therefore want to place the imports and the class declaration inside the cached function, however, as soon as I add super to subclass, I get the following error

UserHashError : ’ class ’

I made the following code to highlight the issue:

import streamlit as st


@st.cache()
def state():
    class Parent:
        def test(self):
            return "parent"

    class child(Parent):
        def test(self):
            par = super().test()
            return "hello"

    test = child()
    return test.test()

st.text(state())

Resulting in the error:

UserHashError : ’ class ’

Error in C:\Users\xxxxx\Devel\RICS\rics-gui-web\st_test_class.py near line 11 :

If you think this is actually a Streamlit bug, please file a bug report here.

Traceback:

  File "C:\Users\xxxxx\st_test_class.py", line 19, in <module>
    st.text(state())

If we remove the super() line, everything runs as expected.
Is this a bug or am I missing something?