Update app.py

app.py

@@ -5,7 +5,7 @@ from fastapi.responses import FileResponse, JSONResponse, HTMLResponse
 from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
 from fastapi.templating import Jinja2Templates
 from pydantic import BaseModel, EmailStr, Field
-from typing import List, Optional
+from typing import List, Optional # Import Optional from typing
 import cv2
 import numpy as np
 import tensorflow as tf
@@ -93,7 +93,7 @@ class Token(BaseModel):
     token_type: str
 
 class TokenData(BaseModel):
-    username: str | None = None
+    username: Optional[str] = None # Use Optional[str] instead of str | None
 
 class OCRResponse(BaseModel):
     sakshi_output: str