[Python-modules-team] Bug#954944: python3-pip: /usr/bin/pip3 wrapper calls old pip entrypoint

[Robi Pires]

Package: python3-pip
Version: 20.0.2-2
Severity: normal

Dear Maintainer,

* What led up to the situation?
   After recently upgrading my system on Debian unstable, the "pip3"
   command started reporting a warning about the /usr/bin/pip3 script.

* What exactly did you do (or not do) that was effective (or
  ineffective)?
  Simply called "pip3" through bash.

* What was the outcome of this action?
   The warning is as follows:

   WARNING: pip is being invoked by an old script wrapper. This will
fail in a future version of pip.
   Please see https://github.com/pypa/pip/issues/5599 for advice on
fixing the underlying issue.
   To avoid this problem you can invoke Python with '-m pip' instead
of running pip directly.

* What outcome did you expect instead?
   I expected no warning to occur.

/usr/bin/pip3 calls pip._internal:main, which has been deprecated.
More information is available at: https://github.com/pypa/pip/issues/7498
The Github issue seems to suggest that the new entrypoint that should be used
is pip._internal.cli.main:main.

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.4.0-3-amd64 (SMP w/2 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages python3-pip depends on:
ii  ca-certificates    20190110
ii  python-pip-whl     20.0.2-2
ii  python3            3.8.2-2
ii  python3-distutils  3.8.2-2
ii  python3.7          3.7.7-1

Versions of packages python3-pip recommends:
ii  build-essential     12.8
ii  python3-dev         3.8.2-2
ii  python3-setuptools  44.0.0-1
ii  python3-wheel       0.34.2-1

python3-pip suggests no packages.

-- no debconf information