Should itsdangerous and Jinja2 be installed in Dockerfile (Chapter 12, Section 6)?

[toukoudo]

Problem

In the Chapter 12, Section 6, docker-compose reports error for app_1.

app_1         | Traceback (most recent call last):
app_1         |   File "/app/tracking.py", line 3, in <module>
app_1         |     from flask import Flask, request, Response
app_1         |   File "/usr/local/lib/python3.9/site-packages/flask/__init__.py", line 14, in <module>
app_1         |     from jinja2 import escape
app_1         | ImportError: cannot import name 'escape' from 'jinja2' (/usr/local/lib/python3.9/site-packages/jinja2/__init__.py)

Suggestion

I think that itsdangerous and Jinja2 should be installed explicitly like below (c.f. Flask issue).

RUN pip install \
 Flask==1.1.2 \
 redis==3.5.3 \
 Flask_Injector==0.12.3 \
 prometheus-client==0.10.1 \
 jaeger-client==4.4.0 \
 opentracing==2.4.0 \
 'Werkzeug<2.0.0' \
 Flask-OpenTracing==1.1.0 \
 itsdangerous==2.0.1 \
 Jinja2==3.0.3

(The versions of its dangerous and Jinja2 are just example. No specific reason.)

With this change, the docker-compose error resolved and API request(http://localhost:8000/test) succeeded