Update app.py

app.py

@@ -4,6 +4,7 @@ import io
 import base64
 from sklearn.impute import SimpleImputer
 
+
 st.set_page_config(page_title="CSV Data Cleaning Tool")
 
 hide_streamlit_style = """
@@ -55,10 +56,12 @@ if uploaded_files:
             imputer = SimpleImputer(strategy='most_frequent')
             df[categorical_cols] = imputer.fit_transform(df[categorical_cols])
             dataframes[i] = df
+            
     st.markdown("Data transform")
-    df = st.dataframe(dataframes)
-    columns = st.selectbox("Select  column", df.columns)
-    old_values = st.multiselect("Current Values",list(df[columns].unique()),list(df[columns].unique()))
+    
+    st.dataframe(dataframes)
+    columns = st.selectbox("Select  column", dataframes.columns)
+    old_values = st.multiselect("Current Values",list(dataframes[columns].unique()),list(dataframes[columns].unique()))