If use element from for in while loop it will have bad iterate.

[MaksBleo]

BPO	40310
Nosy	@remilapeyre
Files	cars_av_by_spider_scr.py

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-04-17.11:06:33.321>
created_at = <Date 2020-04-17.10:17:23.187>
labels = ['interpreter-core', 'invalid', 'type-bug', '3.7']
title = 'If use element from for in while loop it will have bad iterate.'
updated_at = <Date 2020-04-17.11:06:33.320>
user = 'https://bugs.python.org/MaksBleo'

bugs.python.org fields:

activity = <Date 2020-04-17.11:06:33.320>
actor = 'Maks Bleo'
assignee = 'none'
closed = True
closed_date = <Date 2020-04-17.11:06:33.321>
closer = 'Maks Bleo'
components = ['Interpreter Core']
creation = <Date 2020-04-17.10:17:23.187>
creator = 'Maks Bleo'
dependencies = []
files = ['49071']
hgrepos = []
issue_num = 40310
keywords = []
message_count = 3.0
messages = ['366652', '366654', '366655']
nosy_count = 2.0
nosy_names = ['remi.lapeyre', 'Maks Bleo']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue40310'
versions = ['Python 3.7']

[MaksBleo]

Windows 10
Version 1909 (OS Build18363.778)
Python 3.7.7 x64

cars_av_by_spider_scr.py - py file for scrapy.
bash command to use
scrapy runspider cars_av_by_spider_scr.py -o cars_av_by_spider_scr.json > cars_av_by_spider_scr.txt 2>&1

Bad behavior in line 52. (In comment fixed version)

When while loop iterate on second step instead of using
model[0], model[1] it start use model[1][0] and model[1][1].
On third step it crash, out of range.

But if assign value before while loop and use it in while loop everything work fine.

It's my first bug report.

[remilapeyre]

Hi Maks, when you report a bug please write a minimal example that show the bug so we don't have to read the whole application (https://stackoverflow.com/help/minimal-reproducible-example).

I think in this case that the issue is that you overrride model on line 65 model = car[1] hence the error on the next iteration, model has been replaced.

This bug tracker is for bugs in the Python interpreter, for help in using Python please use the python-help mailing list or a forum like StackOverflow.

[MaksBleo]

I don't think that it will overwrite element from for loop. In my mind it
was a bug.

Thank you.

On Fri, Apr 17, 2020, 1:59 PM Rémi Lapeyre <report@bugs.python.org> wrote:

Rémi Lapeyre remi.lapeyre@henki.fr added the comment:

Hi Maks, when you report a bug please write a minimal example that show
the bug so we don't have to read the whole application (
https://stackoverflow.com/help/minimal-reproducible-example).

I think in this case that the issue is that you overrride model on line 65
model = car[1] hence the error on the next iteration, model has been
replaced.

This bug tracker is for bugs in the Python interpreter, for help in using
Python please use the python-help mailing list or a forum like
StackOverflow.

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nosy: +remi.lapeyre

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Python tracker <report@bugs.python.org>
<https://bugs.python.org/issue40310\>

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