Use the return variable of a function or st.session_state

I am learning the streamlit framework and python. My question is related to code design. I'm using a function to apply a transformation to a pandas dataframe and return a variable to pass it to another function or display to the user. On the other hand, I could achieve the same result using st.session_state, assigning the "return" function variable to a st.session_state dictionary that provides access to that variable throughout the code, just like a global variable. So what is the correct pythonic or streamlit way of passing variables?

def some_function (dataframe):
   a = do some transformation
   return a

st.dataframe(somefunction())

or

def some_function (dataframe):
   a = do some transformation
   st.session_state['a'] = a

Thank you so much.

Correct answer

If you have a multi-page application then use st.session_state or st.cache_data Might be a good idea to avoid reloading the entire data or retain some information on each rerun.

There are no real guidelines for this. However, there are 2 advanced features you should read about:

• cache
• Add status to the application

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