Issue 1652387: Nested Objects scope problem (original) (raw)

Created on 2007-02-05 13:35 by kkelchev, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Messages (4)
msg31180 - (view)	Author: kkelchev (kkelchev)	Date: 2007-02-05 13:35
K = MyObj() K.Lines.append('First line to Obj "K"') K.Lines.append('Second line to Obj "K"') L = MyObj() L.Lines.append('First line to Obj "L"') print 'Lines from Obj "K"',K.Lines print 'Lines from Obj "L"',L.Lines Result is: [Dbg]>>> Lines from Obj "K" ['First line to Obj "K"', 'Second line to Obj "K"', 'First line to Obj "L"'] Lines from Obj "L" ['First line to Obj "K"', 'Second line to Obj "K"', 'First line to Obj "L"'] >>> Why data appended into nested list filed “Lines” into different object “K” and “L” appears in both objects ?
msg31181 - (view)	Author: Georg Brandl (georg.brandl) *	Date: 2007-02-05 18:31
Sadly you didn't attach the definition of the class "MyObj". I assume it is like this: class MyObj: Lines = [] In this case, the Lines list object is shared by all instances of MyObj. Please post to the python-list mailing list for further questions about this behavior. If your bug is different, please feel free to reopen this.
msg31182 - (view)	Author: kkelchev (kkelchev)	Date: 2007-02-05 20:34
Sorry :( I forgot to paste definision of Class MyObj yes it is: class MyObj: Lines = [] -------------------------------------- is this a bug ? Or always in Python data in nested object are shared between all objects from same class
msg31183 - (view)	Author: Georg Brandl (georg.brandl) *	Date: 2007-02-05 20:54
Yes, this is exactly what I had written in my previous answer.