[FIXED] Python Flask TypeError: '>=' not supported between instances of 'NoneType' and 'float'

Issue

Please could someone help, other similar questions have been of no use thus far.

I am serving a Python3 Flask server that has been working fine for a while now.

I just started implementing a virtual environment and did all the pip installs, but my app crashed with the following Traceback when I try to run the app withing the venv, and normally:

Traceback (most recent call last):
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\flask\app.py", line 2095, in __call__
    return self.wsgi_app(environ, start_response)
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\flask\app.py", line 2080, in wsgi_app
    response = self.handle_exception(e)
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\flask\app.py", line 2076, in wsgi_app
    ctx.push()
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\flask\ctx.py", line 434, in push
    self.session = session_interface.open_session(self.app, self.request)
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\flask_session\sessions.py", line 344, in open_session
    data = self.cache.get(self.key_prefix + sid)
  File "C:\Users\jason\AppData\Local\Programs\Python\Python310\lib\site-packages\cachelib\file.py", line 194, in get
    if pickle_time == 0 or pickle_time >= time():
TypeError: '>=' not supported between instances of 'NoneType' and 'float'

The error is thrown when I try to get the session data.

So I am uncertain whether it is the venv that broke this, or now something with my machine, because I rolledback on my git versions, and even pip uninstalled some of the recent imports.

Here is the Flask initializer and the first 2 functions:

from flask import Flask, request, session
from flask_session import Session
from functools import wraps
from datetime import timedelta
from json import dumps
from rest.api import api, users_api, setups_api, reports
import os
import shutil


# App Instance
app = Flask(__name__)
project_path = os.path.abspath('.')
app.config['APPLICATION_ROOT'] = project_path
app.config['SESSION_COOKIE_PATH'] = project_path + "/cookies/"
app.config['SESSION_TYPE'] = 'filesystem'
Session(app)


@app.before_request
def make_session_permanent():
    app.permanent_session_lifetime = timedelta(hours=(5))
    if request.path not in ["/api/login", "/api/get-session-data"]:
        if not session.get('user'):
            return "Sign in needed.", 403


@app.route("/api/login", methods=["POST", ])
def login():
    # login things
    session['user'] = "whatever"
    return dumps("")


@app.route("/api/get-session-data")
def give_session_data():
    session_data = {
        "user": session.get("user")
    }
    return dumps(session_data)

Venv requirements are:

bcrypt==3.2.0
cachelib==0.6.0
cffi==1.15.0
click==8.1.2
colorama==0.4.4
cryptography==36.0.2
cycler==0.11.0
distlib==0.3.4
et-xmlfile==1.1.0
filelock==3.7.1
Flask==2.1.1
Flask-Session==0.4.0
fonttools==4.33.3
greenlet==1.1.2
itsdangerous==2.1.2
Jinja2==3.1.1
kiwisolver==1.4.3
MarkupSafe==2.1.1
matplotlib==3.5.2
mysql-connector-python==8.0.28
mysqlclient==2.1.0
numpy==1.22.4
openpyxl==3.0.9
packaging==21.3
pandas==1.4.2
paramiko==2.10.3
Pillow==9.0.1
platformdirs==2.5.2
protobuf==3.20.0
psycopg2==2.9.3
pycparser==2.21
pycryptodome==3.14.1
PyJWT==2.4.0
PyNaCl==1.5.0
pyparsing==3.0.9
PyPDF2==1.27.3
python-dateutil==2.8.2
pytz==2022.1
six==1.16.0
SQLAlchemy==1.4.37
virtualenv==20.14.1
Werkzeug==2.1.0

Thank you in advance!

Solution

So I wasn't able to actually find out what went wrong.

Turns out the solution was to uninstall Python (version 3) on Windows and reinstall it again.

Answered By - Jason Mather