[New-bugs-announce] [issue34991] variable type list [] referential integrity data loss

[Alan]

New submission from Alan <alan.pan at sjtu.edu.cn>:

Dear PythonDev,

Thank you for your tremendous work in building a simpler programming language for all.

As an avid user of lists, I am upset that my list cannot preserve its referential integrity in the attached pythonissue.txt file. In the following, (EXPECTED) includes my expected checkvisit data values, and the following two (OUTPUT)s include the actual checkvisit data structures when called.

Perhaps this is not an issue in Python 3.8., but this is a matter in Python 3.6.


Sincerely,
Alan Jerry Pan, CPA
alan.pan at sjtu.edu.cn
alt. alan.pan at alumni.iu.edu


(EXPECTED) Checkvisit (for every isGoal iteration):
[[5, 3, 4, 2, 1, 0]]
[[5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0]]
[[5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0]]
[[5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0]]
[[5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0]]
[[5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0]]
[[5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0], [5, 3, 4, 2, 1, 0]]

(OUTPUT) Checkvisit print result inside def(visitedPath):
[]
[]
[]
[]
[]
[[5]]
[[5, 3]]
[[5, 3, 4]]
[[5, 3, 4, 2]]
[[5, 3, 4, 2, 1]]
[[5], [5]]
[[5, 3], [5, 3]]
[[5, 3, 4], [5, 3, 4]]
[[5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2, 1], [5, 3, 4, 2, 1]]
[[5], [5], [5]]
[[5, 3], [5, 3], [5, 3]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1]]
[[5], [5], [5], [5]]
[[5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1]]
[[5], [5], [5], [5], [5]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1]]
[[5], [5], [5], [5], [5], [5]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1]]



(OUTPUT)Checkvisit print result in while 0 loop
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[[5]]
[[5]]
[[5]]
[[5]]
[[5]]
[[5, 3]]
[[5, 3]]
[[5, 3]]
[[5, 3]]
[[5, 3]]
[[5, 3]]
[[5, 3, 4]]
[[5, 3, 4]]
[[5, 3, 4]]
[[5, 3, 4]]
[[5, 3, 4, 2]]
[[5, 3, 4, 2]]
[[5, 3, 4, 2, 1]]
[[5], [5]]
[[5], [5]]
[[5], [5]]
[[5], [5]]
[[5], [5]]
[[5, 3], [5, 3]]
[[5, 3], [5, 3]]
[[5, 3], [5, 3]]
[[5, 3], [5, 3]]
[[5, 3], [5, 3]]
[[5, 3], [5, 3]]
[[5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4]]
[[5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2, 1], [5, 3, 4, 2, 1]]
[[5], [5], [5]]
[[5], [5], [5]]
[[5], [5], [5]]
[[5], [5], [5]]
[[5], [5], [5]]
[[5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1]]
[[5], [5], [5], [5]]
[[5], [5], [5], [5]]
[[5], [5], [5], [5]]
[[5], [5], [5], [5]]
[[5], [5], [5], [5]]
[[5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1]]
[[5], [5], [5], [5], [5]]
[[5], [5], [5], [5], [5]]
[[5], [5], [5], [5], [5]]
[[5], [5], [5], [5], [5]]
[[5], [5], [5], [5], [5]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1]]
[[5], [5], [5], [5], [5], [5]]
[[5], [5], [5], [5], [5], [5]]
[[5], [5], [5], [5], [5], [5]]
[[5], [5], [5], [5], [5], [5]]
[[5], [5], [5], [5], [5], [5]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3], [5, 3], [5, 3], [5, 3], [5, 3], [5, 3]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4], [5, 3, 4]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2], [5, 3, 4, 2]]
[[5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1], [5, 3, 4, 2, 1]]

----------
components: IO, Interpreter Core
files: pythonissue.txt
messages: 327746
nosy: alan.pan
priority: normal
severity: normal
status: open
title: variable type list [] referential integrity data loss
type: behavior
versions: Python 3.6
Added file: https://bugs.python.org/file47870/pythonissue.txt

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34991>
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