Hi , I am new to streamlit. While trying to upload a text file as shown in below code using @st.cache, I am getting error to use hash function on it. COuld anyone please help me to resolve this issue… df_uploaded = st.sidebar.file_uploader(‘Choose txt file:’,type = [‘txt’,‘csv’]) @st.cache(show_…

Hi @santosh_boina , You are hitting a case where Streamlit doesn’t know how to compute the hash for an object of type StringIO which is used inside pd.read_table on your file, so Streamlit knows if it has already computed and put into cache a similar uploaded file passing through StringIO. We need t…

Thanks @andfanilo for explaining its usage. Its working now. But, when i use checkbox/selectbox/radio features to filter data to be shown as plots on tool, it reruns entire app.py script and starting from loading data again. Have I overlooked or missed something to include in my code to avoid this k…

Hey @santosh_boina :wave:, This seems to be a bug on our side, I filed an issue for it here . Thanks for bringing it to our attention and feel free to follow/add any additional context in the GitHub issue!

Hi @santosh_boina , I’m not sure if there is a bug here. Is the issue that your report is running slow, giving the impression that the data is being reloaded? Perhaps this is due to your hash_funcs which uses getvalue to determine the hash, thus retrieving the entire contents of the file each time …

Apologies for replying late. Yes you are right, not any bug with features. It seems the problem is with data i am using for upload and hash function.

Returning the full text contents feels a bit heavy for a hash - will ST then be storing it internally as a key? I’ve been using something like this for basing it on the MD5, which has been fine on 25-30MB files: def hash_io(input_io): data = input_io.read() input_io.seek(0) if isinstan…

We should definitely be supporting BytesIO/StringIO directly in @st.cache (probably using @Ian_Calvert ’s scheme here)! I’ll make sure that happens.

This is now being tracked as Github issue 1180 . :v: Thanks for your help, all! :heart:

Hey all :wave:, Supporting BytesIO/StringIO directly in @st.cache was officially merged in 0.57.0 :partying_face:. Also included in 0.57.0 is more detailed error messages for st.cache to help with debugging similar issues.

Hash function error for uploaded text file

Using Streamlit

Adrien_Treuille March 6, 2020, 6:29pm 9

This is now being tracked as Github issue 1180. Thanks for your help, all!

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Hash function error for uploaded text file

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