[Python-bugs-list] [ python-Bugs-757997 ] Using __slots__ with str derived classes can cause segfault

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Bugs item #757997, was opened at 2003-06-20 16:28
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Category: Python Interpreter Core
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: John Ehresman (jpe)
Assigned to: Nobody/Anonymous (nobody)
Summary: Using __slots__ with str derived classes can cause segfault

Initial Comment:
The following results in a segfault on Linux with 2.3b1:
-------------------------
class StringDerived(str):
  __slots__ = ['a']
  def __init__(self, string):
    str.__init__(self, string)
    self.a = 1

class DerivedAgain(StringDerived):
  pass

o = DerivedAgain('hello world')
o.b = 2
--------------------------
Python 2.2.2 raises a TypeError when attempting to
derive a class from str with a non-empty __slots__,
maybe 2.3 should do the same?

I have no use case for deriving from str and defining
__slots__; I encountered the bug when writing test
cases for a debugger.

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