[issue19823] for-each on list aborts earlier than expected

[cost6]

New submission from cost6:

for-each does not iterate over all entries of collection, if one removes elements during the iteration.

Example (misbehaving) code:

def keepByValue(self, key=None, value=[]):
    for row in self.flows:
        if not row[key] in value:
            flows.remove(row)

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components: Interpreter Core
messages: 204653
nosy: cost6
priority: normal
severity: normal
status: open
title: for-each on list aborts earlier than expected
type: behavior
versions: Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19823>
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