Update app.py

app.py

@@ -28,6 +28,7 @@ def login():
     password = st.text_input("Password", type="password")
     if st.button("Login", key="loginkey"):
         for user in data["users"]:
+            users =list(col.find())
             if usrname == user["username"] and password == user["password"]:
                 st.success("Logged in as {}".format(usrname))
                 st.session_state["user"] = "logged"