[issue19729] [regression] str.format sublevel format parsing broken in Python 3.3.3

[STINNER Victor]

STINNER Victor added the comment:

According to hg bisect, the regression comes from:

changeset:   83817:6786e681ed58
branch:      3.3
parent:      83812:cd2457463eeb
user:        Benjamin Peterson <benjamin at python.org>
date:        Fri May 17 17:34:30 2013 -0500
files:       Lib/test/test_unicode.py Misc/NEWS Objects/stringlib/unicode_format.h
description:
only recursively expand in the format spec (closes #17644)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19729>
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