Update app.py

app.py

@@ -12,7 +12,7 @@ import json
 import tiktoken
 import PyPDF2
 import gradio
-
+from gradio import NamedString
 
 def contains_chinese(text):
     for ch in text:
@@ -109,7 +109,7 @@ class Reviewer:
         
 
     def extract_chapter(self, pdf_path):
-        if isinstance(pdf_path, gradio.utils NamedString):
+        if isinstance(pdf_path, NamedString):
             pdf_path = BytesIO(pdf_path.name)  # 将NamedString对象转换为BytesIO对象
         file_object = BytesIO(pdf_path)
         pdf_reader = PyPDF2.PdfReader(file_object)