[Bug 1904271] [NEW] Python 3.9 package is missing dependency on tzdata

[Christian Heimes]

Public bug reported:

Python 3.9 introduced the stdlib module "zoneinfo". The module either
uses the operating sytem's tzdata database or the tzdata Python package.
See https://www.python.org/dev/peps/pep-0615/ for more information.

Debian's and Ubuntu's python3.9 package is missing a dependency on
tzdata. This breaks the zoneinfo module in a minimal container:

$ docker run -ti ubuntu:groovy /bin/bash
# apt update
# apt install -y python3.9
# dpkg -l python3.9
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-=============================================================
ii  python3.9      3.9.0-5      amd64        Interactive high-level object-oriented language (version 3.9)
# python3.9 -c 'import zoneinfo; zoneinfo.ZoneInfo("CET")'
...
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/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 CET'


Anthony Sottile addressed the issue in his Deadsnakes PPA already, https://github.com/deadsnakes/python3.9/commit/d8216a1f585dac9db805d4e3c57f29535cf84cf8

** Affects: python3.9 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1904271

Title:
  Python 3.9 package is missing dependency on tzdata

Status in python3.9 package in Ubuntu:
  New

Bug description:
  Python 3.9 introduced the stdlib module "zoneinfo". The module either
  uses the operating sytem's tzdata database or the tzdata Python
  package. See https://www.python.org/dev/peps/pep-0615/ for more
  information.

  Debian's and Ubuntu's python3.9 package is missing a dependency on
  tzdata. This breaks the zoneinfo module in a minimal container:

  $ docker run -ti ubuntu:groovy /bin/bash
  # apt update
  # apt install -y python3.9
  # dpkg -l python3.9
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name           Version      Architecture Description
  +++-==============-============-============-=============================================================
  ii  python3.9      3.9.0-5      amd64        Interactive high-level object-oriented language (version 3.9)
  # python3.9 -c 'import zoneinfo; zoneinfo.ZoneInfo("CET")'
  ...
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/usr/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 CET'

  
  Anthony Sottile addressed the issue in his Deadsnakes PPA already, https://github.com/deadsnakes/python3.9/commit/d8216a1f585dac9db805d4e3c57f29535cf84cf8

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