[issue5816] Simplify parsing of complex numbers and make complex('inf') valid.

[Mark Dickinson]

Changes by Mark Dickinson <dickinsm at gmail.com>:


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assignee:  -> marketdickinson
components: +Interpreter Core
priority:  -> normal
stage:  -> patch review
type:  -> behavior
versions: +Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5816>
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