[mythtv] MacOS python3.9+ IANA Time Zone Support

[Roland Ernst]

On Fri, Dec 3, 2021 at 11:56 AM John Hoyt <john.hoyt at gmail.com> wrote:

>
>
> On Wed, Dec 1, 2021 at 3:25 PM Roland Ernst <rcrernst at gmail.com> wrote:
>
>> Hi,
>> I kindly ask about the status of macoOs python 3.9+ and the support for
>> IANA time zones:
>> see https://docs.python.org/3/library/zoneinfo.html
>>
>> My question is about recognizing the local time zone if given as
>> 'localtime' parameter.
>> What does the following sequence show:
>>
>> $ python3
>> >>> from zoneinfo import ZoneInfo
>> >>> from datetime import datetime
>> >>> localtz = ZoneInfo('localtime')
>> >>> now = datetime.now(localtz)
>> >>> now.tzname()
>> 'CET'
>> >>> now.tzinfo
>> zoneinfo.ZoneInfo(key='localtime')
>>
>> This should report the name of the the current time zone (in my case
>> 'CET') and the current
>> usage of  pythons 'tzinfo' parameter.
>>
>> My plan is to update the Mythtv's python bindings in that direction.
>>
>
> macOS by default installs older versions of python (on Monterey it
> installs 3.8).
>
> To get python39 support, you'll need to install from somewhere else (e.g.
> macports, homebrew).
>
> When I do my builds, I use macports for a number of reasons that I won't
> go into on this thread and I have recently upgraded the build process
> locally to move to python3.9.
>
> I just tried running the functions you suggest on my system with macports
> python39 and had to add received the following error:
>
> >>> localtz = ZoneInfo('localtime')
>
> Traceback (most recent call last):
>
>   File
> "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/zoneinfo/_common.py",
> line 12, in load_tzdata
>
>     return importlib.resources.open_binary(package_name, resource_name)
>
>   File
> "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/resources.py",
> line 88, in open_binary
>
>     package = _get_package(package)
>
>   File
> "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/resources.py",
> line 49, in _get_package
>
>     module = _resolve(package)
>
>   File
> "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/resources.py",
> line 40, in _resolve
>
>     return import_module(name)
>
>   File
> "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/__init__.py",
> line 127, in import_module
>
>     return _bootstrap._gcd_import(name[level:], package, level)
>
>   File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
>
>   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
>
>   File "<frozen importlib._bootstrap>", line 972, in
> _find_and_load_unlocked
>
>   File "<frozen importlib._bootstrap>", line 228, in
> _call_with_frames_removed
>
>   File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
>
>   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
>
>   File "<frozen importlib._bootstrap>", line 984, in
> _find_and_load_unlocked
>
> ModuleNotFoundError: No module named 'tzdata'
>
>
> During handling of the above exception, another exception occurred:
>
>
> Traceback (most recent call last):
>
>   File "<stdin>", line 1, in <module>
>
>   File
> "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/zoneinfo/_common.py",
> line 24, in load_tzdata
>
>     raise ZoneInfoNotFoundError(f"No time zone found with key {key}")
>
> zoneinfo._common.ZoneInfoNotFoundError: 'No time zone found with key
> localtime'
>
> Can you point me to the missing python module(s)?  I have installed tzdata
> as it seemed like it would have been the correct solution to no avail.
>
>
That's bad. What does the following command give?
$ python3.9 -m pip list | grep tzdata

I do not know how OS X itself organize the zoneinfo data which one can find
on linux under
/usr/share/zoneinfo

Roland
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