Update preprocessor.py

preprocessor.py

@@ -2,17 +2,13 @@ import re
 import pandas as pd
 
 def preprocess(data):
-    pattern = '\d{1,2}/\d{1,2}/\d{2,4},\s\d{1,2}:\d{2}\s-\s'
-    
-
+    pattern = r'\d{1,2}/\d{1,2}/\d{2,4},\s\d{1,2}:\d{2}-\s'  # Capture date and time in separate groups
     messages_and_dates = re.findall(pattern, data)
-    messages = [message_group[0] for message_group in messages_and_dates]  # Extract messages (first group)
-    dates = [message_group[1] for message_group in messages_and_dates]  # Extract dates (second group)
 
-    df = pd.DataFrame({'user_message': messages, 'date': pd.to_datetime(dates, format='%d/%m/%Y, %H:%M - ')})
-    
+    messages = [message_group[0] for message_group in messages_and_dates]
+    dates = [message_group[1] or "NA" for message_group in messages_and_dates]  # Assign "NA" for empty strings
 
-  
+    df = pd.DataFrame({'user_message': messages, 'date': pd.to_datetime(dates, format='%d/%m/%Y, %H:%M - ')})
 
     users = []
     messages = []