Update app.py

app.py

@@ -137,7 +137,7 @@ except Exception:
 def rounded_df(df):
     df = df.copy()
     for col in df.columns:
-        if isinstance(col.values[0], float):
+        if isinstance(df[col].values[0], float):
             df[col] = df[col].apply(lambda x: round(x, 2))
     return df