Update app.py

app.py

@@ -23,8 +23,13 @@ def get_text(ppt_file):
 
 
   result = []
+
+  presentation = Presentation(ppt_file)
+
+  if len(presentation.slides) > 5:
+    raise Exception("Max slide length is 5. Please follow guideline.")
+
   try:
-    presentation = Presentation(ppt_file)
 
     for slide_idx, slide in enumerate(presentation.slides): # 슬라이드 마다 읽기
       string = ''