[issue7465] Call to another class's constructor in unittest.TestCase.setUp returns the same instance multiple times

[Aaron Altman]

Changes by Aaron Altman aa...@tomorrowsfunction.com:


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title: Call to another class's constructor in unittest.TestCase.setUp returns 
the same instance - Call to another class's constructor in 
unittest.TestCase.setUp returns the same instance multiple times

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[issue7465] Call to another class's constructor in unittest.TestCase.setUp returns the same instance multiple times

[R. David Murray]

R. David Murray rdmur...@bitdance.com added the comment:

Yes, this working as intended.  Consider:

Python 2.7a1+ (trunk:76725, Dec  9 2009, 09:26:36)
[GCC 4.4.2] on linux2
Type help, copyright, credits or license for more information.
 class baseClass(object):
... def __init__(self, testList=[]):
... self.testList = testList
... def insertItem(self):
... self.testList.append(testing from baseClass)
...
 a = baseClass()
 b = baseClass()
 del b
 a.insertItem()
 print a.testList
['testing from baseClass']
 b = baseClass()
 print b.testList
['testing from baseClass']


See
http://docs.python.org/faq/design.html#why-are-default-values-shared-between-objects
for an explanation of why.

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nosy: +r.david.murray
priority:  - normal
resolution:  - invalid
stage:  - committed/rejected
status: open - closed
type:  - behavior

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[issue7465] Call to another class's constructor in unittest.TestCase.setUp returns the same instance multiple times

[R. David Murray]

R. David Murray rdmur...@bitdance.com added the comment:

Heh, that first b = baseClass(); del b wasn't supposed to be there and
doesn't change the result, just in case you were wondering.

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