New submission from Rowan Sylvester-Bradley <ro...@sylvesterbradley.org>:
This issue is probably related to issue ??? but I have created it as a separate
issue. When shuffle doesn't crash it sometimes (or maybe always - I haven't
fully analysed this yet) looses most of the elements in the list that it is
supposed to be shuffling. Here is an extract of the code that I'm using:
import io
from io import StringIO
from lxml import etree
import random
filename_xml = 'MockExam5.xml'
with io.open(filename_xml, mode="r", encoding="utf-8") as xml_file:
xml_to_check = xml_file.read()
doc = etree.parse(StringIO(xml_to_check))
exams = doc.getroot()
questions_element = exams.find("questions")
logmsg(L_TRACE, "There are now " +
str(len(questions_element.findall("question"))) + " questions")
logmsg(L_TRACE, "Randomising order of questions in this exam")
random.shuffle(questions_element)
logmsg(L_TRACE, "Finished randomise")
logmsg(L_TRACE, "There are now " +
str(len(questions_element.findall("question"))) + " questions")
And here is the log produced by this code:
21-03-24 18:10:11.989 line: 2057 file: D:\XPS_8700 Extended
Files\Users\RowanB\Documents\My_Scripts NEW\mockexam\put_exam.py 2 There are
now 79 questions
21-03-24 18:10:11.991 line: 2065 file: D:\XPS_8700 Extended
Files\Users\RowanB\Documents\My_Scripts NEW\mockexam\put_exam.py 2 Randomising
order of questions in this exam
21-03-24 18:10:11.992 line: 2067 file: D:\XPS_8700 Extended
Files\Users\RowanB\Documents\My_Scripts NEW\mockexam\put_exam.py 2 Finished
randomise
21-03-24 18:10:11.993 line: 2068 file: D:\XPS_8700 Extended
Files\Users\RowanB\Documents\My_Scripts NEW\mockexam\put_exam.py 2 There are
now 6 questions
How come the shuffle starts off with 79 elements, and finishes with 6?
Thanks - Rowan
----------
messages: 389482
nosy: rowan.bradley
priority: normal
severity: normal
status: open
title: random.shuffle loses most of the elements
type: behavior
versions: Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43618>
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