[New-bugs-announce] [issue1612] infinite recursion when using collections.Sequence in a recursive function (Py30a2)

[Mark Summerfield]

New submission from Mark Summerfield:

In the attached file there are two tiny functions, flatten1() and
flatten2(). There is only one difference between them:
flatten1() has the line:
    if isinstance(x, list):
and flatten2() has this line instead:
    if isinstance(x, collections.Sequence):

flatten1() works perfectly in Python 2.5.1 and Python 30a2 (just comment
out the flatten2() code).
But flatten2() goes into "infinite" recursion in Python 30a2 when trying
to flatten list "c".

----------
components: Interpreter Core
files: bug.py
messages: 58536
nosy: mark
severity: normal
status: open
title: infinite recursion when using collections.Sequence in a recursive function (Py30a2)
type: behavior
versions: Python 3.0
Added file: http://bugs.python.org/file8939/bug.py

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue1612>
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