New submission from Vladislav Ignatenko:
Hi everyone,
I've faced with python interpreter behavior I didn't expected when I was using
code.InteractiveConsole in my remote python console.
I have also detected this behavior on local python interpreter.
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.
>>> import sys
>>> a = 'test string A'
>>> b = 'test string B'
>>> print sys.getrefcount(a) - 1, sys.getrefcount(b) - 1
1 1
>>> a
'test string A'
>>> print sys.getrefcount(a) - 1, sys.getrefcount(b) - 1
2 1
>>> b
'test string B'
>>> print sys.getrefcount(a) - 1, sys.getrefcount(b) - 1
1 2
>>> print a, b
test string A test string B
>>> print sys.getrefcount(a) - 1, sys.getrefcount(b) - 1
1 2
>>> (a, b)
('test string A', 'test string B')
>>> print sys.getrefcount(a) - 1, sys.getrefcount(b) - 1
2 2
>>> sys
>>> print sys.getrefcount(a) - 1, sys.getrefcount(b) - 1
1 1
When I used python interactive console to display variable value on it's own
(no print usage), it holds a hard link on last object, blocking it's
destruction sometimes, if there were no other links to this object. When user
perform an 'eval' calculation, result is displayed, and interpreter holds a
hard link to it, however user can not access it.
1. Is this behavior normal?
2. Is there any way to clean this link directly?
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<http://bugs.python.org/issue25273>
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