Deleted positions lists

[iqanansoft]

BPO	43099
Nosy	@ericvsmith

^{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 2021-02-02.08:19:10.192>
created_at = <Date 2021-02-02.08:06:03.400>
labels = ['type-bug', 'invalid', '3.9']
title = 'Deleted positions lists'
updated_at = <Date 2021-02-02.08:19:10.190>
user = 'https://bugs.python.org/iqanansoft'

bugs.python.org fields:

activity = <Date 2021-02-02.08:19:10.190>
actor = 'eric.smith'
assignee = 'none'
closed = True
closed_date = <Date 2021-02-02.08:19:10.192>
closer = 'eric.smith'
components = []
creation = <Date 2021-02-02.08:06:03.400>
creator = 'iqanansoft'
dependencies = []
files = []
hgrepos = []
issue_num = 43099
keywords = []
message_count = 2.0
messages = ['386130', '386131']
nosy_count = 2.0
nosy_names = ['eric.smith', 'iqanansoft']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43099'
versions = ['Python 3.9']

[iqanansoft]

Hello, in a list, when using the slice notation, if a higher rank is placed than the new data, the positions of the list are removed

list_test=[0,1,2,3,4,5,6]
list_test[2:4]=["two","three"]

result-->[0,1,'two','three',4,5,6]

this is correct, but this

list_test=[0,1,2,3,4,5,6]
list_test[2:21]=["two","three"]

result-->[0,1,'two','three']

deleted last positions

[ericvsmith]

That's the correct behavior. The elements given by the start and end range are replaced by what's on the right hand side of the assignment. They don't need to be the same length.

>>> list_test=[0,1,2,3,4,5,6]
>>> list_test[2:5] = ['two', 'three']
>>> list_test
[0, 1, 'two', 'three', 5, 6]