Question: I am trying to get a Flask and Docker application to work but when I try and run it using my docker-compose up command in my Visual Studio terminal, it gives me an ImportError called ImportError: cannot import name 'json' from itsdangerous. I have tried to look for possible solutions to this problem but as of right now there are not many on here or anywhere else. The only two solutions I could find are to change the current installation of MarkupSafe and itsdangerous to a higher version: https://serverfault.com/questions/1094062/from-itsdangerous-import-json-as-json-importerror-cannot-import-name-json-fr and another one on GitHub that tells me to essentially change the MarkUpSafe and itsdangerous installation again https://github.com/aws/aws-sam-cli/issues/3661, I have also tried to make a virtual environment named veganetworkscriptenv to install the packages but that has also failed as well. I am currently using Flask 2.0.0 and Docker 5.0.0 and the error occurs on line eight in vegamain.py. Here is the full ImportError that I get when I try and run the program: veganetworkscript-backend-1 | Traceback (most recent call last): veganetworkscript-backend-1 | File "/app/vegamain.py", line 8, in <module> veganetworkscript-backend-1 | from flask import Flask veganetworkscript-backend-1 | File "/usr/local/lib/python3.9/site-packages/flask/__init__.py", line 19, in <module> veganetworkscript-backend-1 | from . import json veganetworkscript-backend-1 | File "/usr/local/lib/python3.9/site-packages/flask/json/__init__.py", line 15, in <module> veganetworkscript-backend-1 | from itsdangerous import json as _json veganetworkscript-backend-1 | ImportError: cannot import name 'json' from 'itsdangerous' (/usr/local/lib/python3.9/site-packages/itsdangerous/__init__.py) veganetworkscript-backend-1 exited with code 1  Here are my requirements.txt, vegamain.py, Dockerfile, and docker-compose.yml files: requirements.txt: Flask==2.0.0 Flask-SQLAlchemy==2.4.4 SQLAlchemy==1.3.20 Flask-Migrate==2.5.3 Flask-Script==2.0.6 Flask-Cors==3.0.9 requests==2.25.0 mysqlclient==2.0.1 pika==1.1.0 wolframalpha==4.3.0  vegamain.py: # Veganetwork (C) TetraSystemSolutions 2022 # all rights are reserved. # # Author: Trevor R. Blanchard Feb-19-2022-Jul-30-2022 # # get our imports in order first from flask import Flask # <-- error occurs here!!! # start the application through flask. app = Flask(__name__) # if set to true will return only a "Hello World" string. Debug = True # start a route to the index part of the app in flask. @app.route('/') def index(): if (Debug == True): return 'Hello World!' else: pass # start the flask app here ---> if __name__ == '__main__': app.run(debug=True, host='0.0.0.0')  Dockerfile: FROM python:3.9 ENV PYTHONUNBUFFERED 1 WORKDIR /app COPY requirements.txt /app/requirements.txt RUN pip install -r requirements.txt COPY . /app  docker-compose.yml: version: '3.8' services: backend: build: context: . dockerfile: Dockerfile command: 'python vegamain.py' ports: - 8004:5000 volumes: - .:/app depends_on: - db # queue: # build: # context: . # dockerfile: Dockerfile # command: 'python -u consumer.py' # depends_on: # - db db: image: mysql:5.7.22 restart: always environment: MYSQL_DATABASE: admin MYSQL_USER: root MYSQL_PASSWORD: root MYSQL_ROOT_PASSWORD: root volumes: - .dbdata:/var/lib/mysql ports: - 33069:3306  How exactly can I fix this code? thank you!

Answer: I just put itsdangerous==2.0.1 in my requirements.txt .Then updated my virtualenv using pip install -r requirements.txt and then docker-compose up --build . Now everything fine for me. Didnot upgrade the flask version.