Update app.py

app.py

@@ -28,7 +28,7 @@ def login():
     password = st.text_input("Password", type="password")
     if st.button("Login", key="loginkey"):
         users =list(col.find())
-        for user in data["users"]:
+        for user in users:
             
             if usrname == user["username"] and password == user["password"]:
                 st.success("Logged in as {}".format(usrname))