switched to object syntax for columns; use to_hdf_binary; some cleanup

download.py

@@ -1,32 +1,31 @@
 import streamlit as st
 
-from utils.df_utils import to_excel_binary
+from utils.df_utils import to_excel_binary, to_hdf_binary
+
+
+state = st.session_state
 
 
 def download(df):
-    showing_downloads = st.session_state.get("showing_downloads", False)
+    showing_downloads = state.get("showing_downloads", False)
 
-    col1, col2, col3, col4 = st.columns([1, 1, 1, 1])
-    with col1:
-        if st.button("Downloads") and not showing_downloads:
-            st.session_state.showing_downloads = True
+    col0, col1, col2, col3 = st.columns(4)
+    if col0.button("Downloads") and not showing_downloads:
+        state.showing_downloads = True
 
-            with col2:
-                with open("output.h5", "rb") as f:
-                   st.download_button("📥 hdf5", f, file_name="output.h5")
+        h5 = to_hdf_binary(df)
+        col1.download_button("📥 hdf5", h5, file_name="output.h5")
 
-            with col3:
-                xlsx = to_excel_binary(df)
-                st.download_button("📥 xlsx", xlsx, file_name="output.xlsx")
+        xlsx = to_excel_binary(df)
+        col2.download_button("📥 xlsx", xlsx, file_name="output.xlsx")
 
-            with col4:
-                csv = df.to_csv()
-                st.download_button("📥 csv", csv, file_name="output.csv")
+        csv = df.to_csv()
+        col3.download_button("📥 csv", csv, file_name="output.csv")
 
-    #        st.stop()
+#        st.stop()
 
-        else:
-            st.session_state.showing_downloads = False
+    else:
+        state.showing_downloads = False