[issue20003] Language Ref "raise" doc misssing "from None"

[rurpy]

New submission from rurpy:

In the current (3.3.3 and 3.4dev) Language Reference Manual, the section on the Raise statement fails to mention that the second expression can be None (per PEP-409/415) or the special behavior (suppressing a chained exception) that ensues.  Rather it explicitly states it can not be None:
 "...the second expression must be another exception class  or instance..."

It appears that although the Exceptions section of the Library Reference was updated when PEP-409/415 was implemented, the Language Reference was not.

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assignee: docs at python
components: Documentation
messages: 206400
nosy: docs at python, rurpy2
priority: normal
severity: normal
status: open
title: Language Ref "raise" doc misssing "from None"
versions: Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20003>
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