[Bug 1859948] [NEW] behaviour matrix depends on how it is created

[Jaap Woldringh]

Public bug reported:

In Python3 (and in Python2) the behaviour of a matrix depends on how it is created. If elements are assigned directly, it behaves as it should, but if a row is created and then several of these rows are appended to the matrix, this matrix misbehaves, even when it appears to be the same matrix as the first one.
I have added a .py program that shows the bug: codevierkant_experiment.py.
The same happens in Python2, and also in the newer Python3 in Ubuntu 19.10

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: python3 3.6.7-1~18.04
ProcVersionSignature: Ubuntu 5.0.0-37.40~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-37-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Jan 16 10:17:39 2020
InstallationDate: Installed on 2019-09-05 (132 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=nl_NL.UTF-8
 SHELL=/bin/bash
SourcePackage: python3-defaults
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: python3-defaults (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

** Attachment added: "codevierkant_experiment.py"
   https://bugs.launchpad.net/bugs/1859948/+attachment/5320805/+files/codevierkant_experiment.py

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https://bugs.launchpad.net/bugs/1859948

Title:
  behaviour matrix depends on how it is created

Status in python3-defaults package in Ubuntu:
  New

Bug description:
  In Python3 (and in Python2) the behaviour of a matrix depends on how it is created. If elements are assigned directly, it behaves as it should, but if a row is created and then several of these rows are appended to the matrix, this matrix misbehaves, even when it appears to be the same matrix as the first one.
  I have added a .py program that shows the bug: codevierkant_experiment.py.
  The same happens in Python2, and also in the newer Python3 in Ubuntu 19.10

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: python3 3.6.7-1~18.04
  ProcVersionSignature: Ubuntu 5.0.0-37.40~18.04.1-generic 5.0.21
  Uname: Linux 5.0.0-37-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jan 16 10:17:39 2020
  InstallationDate: Installed on 2019-09-05 (132 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=nl_NL.UTF-8
   SHELL=/bin/bash
  SourcePackage: python3-defaults
  UpgradeStatus: No upgrade log present (probably fresh install)

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