exercise 1 of chapter 6

[hiddenblue]

In this part, the dockerfile didn't point out the a specific Python3 version and build the image with newest python3 version by default ，which cause some problems.
For example , for python 3.10, some old features were removed.

["Awaitable", "Coroutine", "AsyncIterable", "AsyncIterator", "AsyncGenerator", "Hashable", "Iterable", "Iterator", "Generator", "Reversible", "Sized", "Container", "Callable", "Collection", "Set", "MutableSet", "Mapping", "MutableMapping", "MappingView", "KeysView", "ItemsView", "ValuesView", "Sequence", "MutableSequence", "ByteString"]

if we build the target docker image with the dockfile in sourcecode, we will capture some bugs

Collecting peewee==3.0.4
  Downloading peewee-3.0.4.tar.gz (592 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 592.1/592.1 kB 2.7 MB/s eta 0:00:00
  Preparing metadata (setup.py): started
  Preparing metadata (setup.py): finished with status 'error'
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [11 lines of output]
      /tmp/pip-install-mjill3ii/peewee_8a9f4baa9bdb444c9f5b97bab68d2996/setup.py:22: UserWarning: Cython C extensions for peewee will NOT be built, because Cython does not seem to be installed. To enable Cython C extensions, install Cython >=0.22.1.
        warnings.warn('Cython C extensions for peewee will NOT be built, because '
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/tmp/pip-install-mjill3ii/peewee_8a9f4baa9bdb444c9f5b97bab68d2996/setup.py", line 66, in <module>
          version=__import__('peewee').__version__,
                  ^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-install-mjill3ii/peewee_8a9f4baa9bdb444c9f5b97bab68d2996/peewee.py", line 157, in <module>
          from collections import Callable
      ImportError: cannot import name 'Callable' from 'collections' (/usr/local/lib/python3.11/collections/__init__.py)
      [end of output]

we can see it uses the python3.11 by default.
After replacing python3 with python 3.11, I solved the problem

So, I think it's better to point out a specific python3 version in your dockerfiles.
like python 3.7
FROM python:3.7-alpine

[SathyaBhat]

Hi, thanks for the report. I'll update them in the repo

[SathyaBhat]

thank you, I have updated the Dockerfiles.