[New-bugs-announce] [issue16791] itertools.chain.from_iterable doesn't stop

[David Halter]

New submission from David Halter:

The following lines run infinitely:

b = [1]
import itertools
b += itertools.chain.from_iterable([c] for c in b)

In my opinion this is a bug. Clearly you could say that this is an implementation detail. But afaik this is not documented and very misleading.

BTW: In PyPy b would be [1, 1].

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messages: 178296
nosy: davidhalter
priority: normal
severity: normal
status: open
title: itertools.chain.from_iterable doesn't stop
type: behavior
versions: Python 2.7, Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16791>
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