returning a dataframe?

app.py

@@ -2,6 +2,7 @@ import gradio as gr
 import parselmouth
 from parselmouth.praat import call
 import numpy as np
+import pandas as pd
 
 def get_pitch(audio_data):
     rate, data = audio_data
@@ -16,7 +17,11 @@ def get_pitch(audio_data):
         pitch = call(sound, "To Pitch", 0.0, 75, 500)
         pitch_values = pitch.selected_array['frequency']
         # return "Pitch frequencies: " + str(pitch_values)
-        return pitch_values
+        pitch_values[pitch_values==0] = np.nan
+        df_pitch = pd.DataFrame(np.column_stack([pitch.xs(), pitch_values]), 
+                                columns=['time', 'pitch']) 
+        
+        return df_pitch
     except Exception as e:
         return "Error in pitch extraction: " + str(e)