Python 3.x session, class, and serialization - python-3.x

Question

EDIT: I wonder if you think the issue might be that I'm trying to store an entire dictionary row returned from database in a session variable?
Here's the error (full error printout is at bottom of this post):
TypeError: Object of type User is not JSON serializable
FYI: I'm not using JSON anywhere in my code.
Here's the relevant parts of my code (main.py):
class User():
def __init__(self, t_id_user=None, t_email=None):
self.t_id_user = t_id_user
self.t_email = t_email
def create_or_update(self, t_create_or_edit="Edit"):
#How necessary are the "=None" below?
#self.t_id_user = userCreate(self, t_id_user=None, t_email=None):
#How necessary are the "=None" above?
if t_create_or_edit == "Create":
self.t_id_user = userCreate(
self.t_email
)
else:
self.t_id_user = userUpdate(
self.t_id_user_edit,
self.t_email
)
def get_from_id(self, t_id_user):
# logic to retrieve your user's data from your database of choice
myData = usersGet(
t_id_user="0",
t_email=""
)
self.t_id_user = myData["t_id_user"]
self.t_email = myData["t_email"]
return self
def userClearSession(t_which="user_current"):
logging.debug("Start of userClearSession()")
t_id_user = "0"
t_email = ""
user_instance = User(t_id_user, t_email)
if t_which == "user_current":
session["user_current"] = user_instance
else:
session["user_edit"] = user_instance
return
#app.route('/', methods=['GET', 'POST'])
#app.route('/userRegister', methods=['GET', 'POST'])
def index(t_title="Login or Register", t_message=""):
if "user_current" not in session:
userClearSession(t_which="user_current")
return render_template(
"userRegister.html",
t_message=t_message,
t_js="userRegister.js",
t_title=t_title
)
def userCreate(t_which="current"):
id_user = 0
db_cursor = data_cursor()
q = ""
q += "INSERT INTO tbl_users "
q += " ( "
q += " i_security_level"
q += ", t_email"
q += " ) "
q += " VALUES "
q += " ( "
q += " %(t_security_level)s"
q += ", '%(t_email)s'"
q += " ) "
try:
if t_which == "current":
user_instance = session["user_current"]
else:
user_instance = session["user_edit"]
vars = {
't_security_level': int(session["user_instance"].t_security_level),
't_email': AsIs(session["user_instance"].t_email)
}
db_cursor.execute(q,vars)
except Exception as e:
t_message = "Error"
else:
id_found = userIsInDB(session["user_instance"].t_email)
if id_found >= 1:
t_id_user = id_found
if t_which == "current":
session["user_current"].t_id_user = t_id_user
else:
session["user_edit"].t_id_user = t_id_user
t_message = "User Created"
db_cursor.close()
db_conn.close()
The full error message:
I'm having a hard time getting any meaning out of this error message and need help. It doesn't appear to point to any parts of main.py, though I know the error is somewhere in there and I'm pretty sure I narrowed it down to the code you see above:
File "C:\Python\Python38\Lib\site-packages\flask\app.py", line 2464, in __call__
return self.wsgi_app(environ, start_response)
File "C:\Python\Python38\Lib\site-packages\flask\app.py", line 2450, in wsgi_app
response = self.handle_exception(e)
File "C:\Python\Python38\Lib\site-packages\flask\app.py", line 1867, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Python\Python38\Lib\site-packages\flask\_compat.py", line 39, in reraise
raise value
File "C:\Python\Python38\Lib\site-packages\flask\app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "C:\Python\Python38\Lib\site-packages\flask\app.py", line 1953, in full_dispatch_request
return self.finalize_request(rv)
File "C:\Python\Python38\Lib\site-packages\flask\app.py", line 1970, in finalize_request
response = self.process_response(response)
File "C:\Python\Python38\Lib\site-packages\flask\app.py", line 2269, in process_response
self.session_interface.save_session(self, ctx.session, response)
File "C:\Python\Python38\Lib\site-packages\flask\sessions.py", line 378, in save_session
val = self.get_signing_serializer(app).dumps(dict(session))
File "C:\Python\Python38\Lib\site-packages\itsdangerous\serializer.py", line 166, in dumps
payload = want_bytes(self.dump_payload(obj))
File "C:\Python\Python38\Lib\site-packages\itsdangerous\url_safe.py", line 42, in dump_payload
json = super(URLSafeSerializerMixin, self).dump_payload(obj)
File "C:\Python\Python38\Lib\site-packages\itsdangerous\serializer.py", line 133, in dump_payload
return want_bytes(self.serializer.dumps(obj, **self.serializer_kwargs))
File "C:\Python\Python38\Lib\site-packages\flask\json\tag.py", line 305, in dumps
return dumps(self.tag(value), separators=(",", ":"))
File "C:\Python\Python38\Lib\site-packages\flask\json\__init__.py", line 211, in dumps
rv = _json.dumps(obj, **kwargs)
File "C:\Python\Python38\Lib\json\__init__.py", line 234, in dumps
return cls(
File "C:\Python\Python38\Lib\json\encoder.py", line 199, in encode
chunks = self.iterencode(o, _one_shot=True)
File "C:\Python\Python38\Lib\json\encoder.py", line 257, in iterencode
return _iterencode(o, 0)
File "C:\Python\Python38\Lib\site-packages\flask\json\__init__.py", line 100, in default
return _json.JSONEncoder.default(self, o)
File "C:\Python\Python38\Lib\json\encoder.py", line 179, in default
Open an interactive python shell in this frameraise TypeError(f'Object of type {o.__class__.__name__}