Update app.py

app.py

@@ -42,8 +42,8 @@ def generate_random_string(length):
 #random_string = generate_random_string(20)
 #directory_path=random_string
 
-if "directory_path" not in st.session_state:
-    st.session_state.directory_path = generate_random_string(20)
+#if "directory_path" not in st.session_state:
+#    st.session_state.directory_path = generate_random_string(20)
 
 with st.sidebar:
     st.subheader("Upload your Documents Here: ") 
@@ -56,7 +56,9 @@ with st.sidebar:
             st.stop()      
         else:   #如果已经上传文件，则装载文件SimpleDirectoryReader.load_data()
             #st.session_state.pdf_files=pdf_files
-            if not os.path.exists(st.session_state.directory_path):
+            #if not os.path.exists(st.session_state.directory_path):
+            if "directory_path" not in st.session_state:
+                st.session_state.directory_path = generate_random_string(20)
                 os.makedirs(st.session_state.directory_path)
                 for pdf_file in st.session_state.pdf_files:
                     #for pdf_file in pdf_files: