docker-library / docker-library/python
Include tzdata-legacy in python slim images after move to Debian Trixie?
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Description
This may be an expected breaking change, but running the following python code in python:slim stopped working yesterday with the move to Debian Trixie :
>> from zoneinfo import ZoneInfo
>> ZoneInfo("US/Central")
Traceback (most recent call last):
File "/usr/local/lib/python3.10/zoneinfo/_common.py", line 12, in load_tzdata
return importlib.resources.open_binary(package_name, resource_name)
File "/usr/local/lib/python3.10/importlib/resources.py", line 43, in open_binary
package = _common.get_package(package)
File "/usr/local/lib/python3.10/importlib/_common.py", line 66, in get_package
resolved = resolve(package)
File "/usr/local/lib/python3.10/importlib/_common.py", line 57, in resolve
return cand if isinstance(cand, types.ModuleType) else importlib.import_module(cand)
File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 992, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 992, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 1004, 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 "/usr/local/lib/python3.10/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 US/Central'
>
This could break existing users that are depending on those timezone strings being available like they were before. This is apparently an expected change in Trixie that installing the tzdata-legacy package would resolve, so throwing that out as a possible mitigation.
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the shown ZoneInfo("US/Central") failure in a python:slim image, then inspect how the slim image installs Debian packages after the Trixie move. Verify whether tzdata-legacy restores the legacy timezone keys and determine which python:slim variants would need coverage; done means the affected lookup works without breaking image builds.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- debian, docker, python
- Domain
- devops
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 52/100