[issue29552] Issue in Dictionary fromkeys
New submission from Prudvi Mangadu:
If we load the keys and values using fromkeys on dic.
Later the modification in the values is reflects for all keys in the DIC,
please follow the below code.
###
PS C:\Python27> py
Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> input = ['1','2']
>>> result = {}
>>> result = result.fromkeys(input,[]) >>>> Issue with this line
>>>
>>> result
{'1': [], '2': []}
>>>
>>> result['1'].append("item1")
>>>
>>> result
{'1': ['item1'], '2': ['item1']} >>>>>>>>>>>>>>>>>> Here result['2'] also
overwrites
>>>
>>> result['1'].append("item2")
>>> result
{'1': ['item1', 'item2'], '2': ['item1', 'item2']} >>>>>>>>>>>>>>>>>> Here
result['2'] also overwrites
>>>
>>>
###
--
components: Windows
messages: 287747
nosy: paul.moore, prudvibt81, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Issue in Dictionary fromkeys
type: behavior
versions: Python 2.7
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[issue29552] Issue in Dictionary fromkeys
Prudvi Mangadu added the comment:
Workaround is replace the below 2 lines with "result ={D_IP:[] for D_IP in
input}"
==
result = {}
result = result.fromkeys(input,[]) >>>> Issue with this line
==
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[issue29552] Issue in Dictionary fromkeys
Prudvi Mangadu added the comment: Also observed that ID of the values are pointing same, its ok. But if some one later modified that values which causes the un-usual output. >>> id(result['1']) 38121184 >>> id(result['2']) 38121184 -- ___ Python tracker <http://bugs.python.org/issue29552> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue29552] Issue in Dictionary fromkeys
Prudvi Mangadu added the comment: Thanks Martin , I will close it. -- stage: -> resolved status: open -> closed ___ Python tracker <http://bugs.python.org/issue29552> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
