minor fixes

handler.py

@@ -36,7 +36,10 @@ class Utterance:
         self.role = None
         self.word_count = self.get_num_words()
         self.timestamp = [starttime, endtime]
-        self.unit_measure = None
+        if starttime is not None and endtime is not None:                   
+            self.unit_measure = endtime - starttime
+        else:
+            self.unit_measure = None
         self.aggregate_unit_measure = endtime
         self.num_math_terms = None
         self.math_terms = None
@@ -138,11 +141,14 @@ class Transcript:
                 utt.role = 'student'
                 student_words += utt.get_num_words()
                 student_utt_count += 1
-        teacher_percentage = round(
-            (teacher_words / (teacher_words + student_words)) * 100)
-        student_percentage = 100 - teacher_percentage
-        avg_teacher_length = teacher_words / teacher_utt_count
-        avg_student_length = student_words / student_utt_count
+        if teacher_words + student_words > 0:         
+            teacher_percentage = round(
+                (teacher_words / (teacher_words + student_words)) * 100)
+            student_percentage = 100 - teacher_percentage
+        else:
+            teacher_percentage = student_percentage = 0
+        avg_teacher_length = teacher_words / teacher_utt_count if teacher_utt_count > 0 else 0
+        avg_student_length = student_words / student_utt_count if student_utt_count > 0 else 0
         return {'teacher': teacher_percentage, 'student': student_percentage}, {'teacher': avg_teacher_length, 'student': avg_student_length}
 
     def get_word_cloud_dicts(self):
@@ -150,8 +156,6 @@ class Transcript:
         student_dict = {}
         uptake_teacher_dict = {}
         stop_words = stopwords.words('english')
-        # stopwords = nltk.corpus.stopwords.word('english')
-        # print("stopwords: ", stopwords)
         for utt in self.utterances:
             words = (utt.get_clean_text(remove_punct=True)).split(' ')
             for word in words:
@@ -411,10 +415,6 @@ class EndpointHandler():
         utterances = data.pop("inputs", data)
         params = data.pop("parameters", None)
 
-        print("EXAMPLES")
-        for utt in utterances[:3]:
-            print("speaker %s: %s" % (utt["speaker"], utt["text"]))
-
         transcript = Transcript(filename=params.pop("filename", None))
         for utt in utterances:
             transcript.add_utterance(Utterance(**utt))