New submission from Petri Lehtinen <[email protected]>:
The documentation of generator.throw() gives this signature:
generator.throw(type[, value[, traceback]])
Looking at the code, it accepts the following arguments:
g.throw(ExcType) --> raise ExcType()
g.throw(ExcType, None) --> raise ExcType()
g.throw(ExcType, None, tb) --> raise ExcType().with_traceback(tb)
g.throw(ExcType, instace_of_ExcType) --> raise instance_of_ExcType
g.throw(ExcType, instace_of_ExcType, tb) --> raise
instance_of_ExcType.with_traceback(tb)
g.throw(ExcType, other_value) --> raise ExcType(other_value)
g.throw(ExcType, other_value, tb) --> raise
ExcType(other_value).with_traceback(tb)
Up to this point, I think everything is in line with the documentation. But it
also accepts the following (now that issue 13188 is fixed):
g.throw(exc_instance) --> raise exc_instance (preserving the traceback of
exc_instance)
g.throw(exc_instance, None) --> raise exc_instance (preserving the traceback
of exc_instance)
g.throw(exc_instance, None, tb) --> raise exc_instance.with_traceback(tb)
It does not accept these, throwing a TypeError:
g.throw(exc_instance, some_value_other_than_None)
g.throw(exc_instance, some_value_other_than_None, tb)
g.throw(exc_instance, tb)
The documentation is really unclear on throwing existing exception instances
with (exc_instance) or (exc_instance, None), and that calling with (type,
value) or (type, value, tb) will create a new exception if not
isinstance(value, type).
----------
assignee: docs@python
components: Documentation, Interpreter Core
messages: 145848
nosy: docs@python, ezio.melotti, ncoghlan, petri.lehtinen, pitrou
priority: normal
severity: normal
status: open
title: generator.throw() behavior
type: behavior
versions: Python 2.7, Python 3.2, Python 3.3
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Python tracker <[email protected]>
<http://bugs.python.org/issue13213>
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