[Python-bugs-list] [ python-Bugs-420343 ] SystemError from tuple() builtin

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Bugs item #420343, was updated on 2001-04-30 19:18
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=420343&group_id=5470

Category: Python Interpreter Core
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Greg Chapman (glchapman)
Assigned to: Nobody/Anonymous (nobody)
Summary: SystemError from tuple() builtin

Initial Comment:
The following produces a SystemError under Python 2.1:

>>> class Test:
... 	def __init__(self):
... 		self.list = [1]
... 	def __len__(self):
... 		return 0
... 	def __getitem__(self, index):
... 		return self.list[index]
... 
>>> t = Test()
>>> tuple(t)
Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
SystemError: C:\USERS\greg\PROG\CPP\PYTHON\Python-2.1
\Objects\tupleobject.c:506: bad argument to internal 
function

The problem is the call made by PySequence_Tuple to 
_PyTuple_Resize.  The above code results in an attempt 
to resize the empty tuple, the ref count of which is 
greater than 1.




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