Brett Cannon added the comment:

Skipping select frames is a shift in semantics for warnings.warn() (so can't go 
into 3.5b1), doing it implicitly might be costly on interpreters where getting 
a frame is expensive, and coming up with a new API allows for a nicer design, 
e.g. `warnings.deprecate_module(__name__, 'it will be removed in Python 3.6')` 
-> "the formatter module is deprecated; it will be removed in Python 3.6"

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24305>
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