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Issue 20363: Graphics pickling failure

archive/issues_020126.json:

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    "body": "<div id=\"comment:0\"></div>\n\nOn sage-7.2.beta2 we have\n\n```\nsage: g2d = text('A', (0,0)) + arrow((0,0), (1,1), linestyle=\"dotted\")\nsage: g2d.show()\nLaunched png viewer for Graphics object consisting of 2 graphics primitives\nsage: dumps(g2d)\n---------------------------------------------------------------------------\nTraceback (most recent call last):\n...\nPicklingError: Can't pickle <class 'sage.plot.arrow.ConditionalStroke'>: attribute\nlookup sage.plot.arrow.ConditionalStroke failed\n```\nThough the following works!!\n\n```\nsage: g2d = text('A', (0,0)) + arrow((0,0), (1,1), linestyle=\"dotted\")\nsage: dumps(g2d)\n'x\\x9cU\\x91\\xc9n\\xc20...\\xe0'\n```\n\nCC:  @sagetrac-mhs\n\nComponent: **pickling**\n\nKeywords: **bug**\n\n_Issue created by migration from https://trac.sagemath.org/ticket/20363_\n\n",
    "created_at": "2016-04-05T21:32:56Z",
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    "repository": "https://github.com/sagemath/sage",
    "title": "Graphics pickling failure",
    "type": "issue",
    "updated_at": "2022-12-29T01:35:57Z",
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On sage-7.2.beta2 we have

sage: g2d = text('A', (0,0)) + arrow((0,0), (1,1), linestyle="dotted")
sage: g2d.show()
Launched png viewer for Graphics object consisting of 2 graphics primitives
sage: dumps(g2d)
---------------------------------------------------------------------------
Traceback (most recent call last):
...
PicklingError: Can't pickle <class 'sage.plot.arrow.ConditionalStroke'>: attribute
lookup sage.plot.arrow.ConditionalStroke failed

Though the following works!!

sage: g2d = text('A', (0,0)) + arrow((0,0), (1,1), linestyle="dotted")
sage: dumps(g2d)
'x\x9cU\x91\xc9n\xc20...\xe0'

CC: @sagetrac-mhs

Component: pickling

Keywords: bug

Issue created by migration from https://trac.sagemath.org/ticket/20363

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