[FIXED] ImportError: cannot import name 'json' from itsdangerous

Issue

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!

Solution

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.

Answered By – Safayet Jamil

Answer Checked By – Mary Flores (Easybugfix Volunteer)

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