[issue29193] Remove support of format_string as keyword argument in string.Formatter().format()

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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assignee:  -> serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29193>
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