fix sytax error

api/main.py

@@ -42,6 +42,7 @@ import traceback
 import logging
 import gSlide
 import aiofiles
+import json
 pymysql.install_as_MySQLdb()
 
 app = FastAPI()
@@ -129,8 +130,8 @@ def protected(request: Request, Authorize: AuthJWT = Depends()):
     Authorize.jwt_required()
     current_user = Authorize.get_jwt_subject()
     user_obj = first(db.query('SELECT * FROM users where username ="'+str(current_user)+'"'))
-    video_num = first(db.query('SELECT COUNT(*) FROM history_input WHERE user_id ='+str(user_obj['id'])))
-    total_sec = first(db.query('SELECT SUM(duration) FROM history_input where user_id='+str(user_obj['id'])))
+    video_num = first(db.query('SELECT COUNT(*) FROM history_input WHERE user_id ='+str(user_obj['id'])))[1]
+    total_sec = first(db.query('SELECT SUM(duration) FROM history_input where user_id='+str(user_obj['id'])))[1]
     left_sec = user_obj['left_time']
 
     video_info_list = []
@@ -138,7 +139,8 @@ def protected(request: Request, Authorize: AuthJWT = Depends()):
     for row in db.query(statement):
         video_info_list.append({'id':row['id'],'title':row['name'],'duration':row['duration'],'url':row['url']})
     dic_return = {'user_info':{'userName':current_user,'email':user_obj['email'],'video_num':video_num,'total_sec':total_sec,'left_sec':user_obj['left_time']},'video_info':video_info_list}
-    return str(dic_return)
+    str_return = json.dumps(dic_return)
+    return str_return
 
 # login & register page
 @app.get("/login", response_class=HTMLResponse)