New submission from Christopher Stelma:
When I try to re-raise an exception with a __cause__ inside a nested exception,
the __context__ of the outer __context__ appears to be reset to None.
e.g.
>>> try:
... try:
... raise Exception('foo')
... except Exception as foo:
... print(foo, foo.__context__, foo.__cause__)
... try:
... raise Exception('bar') from foo
... except Exception as bar:
... print(bar, bar.__context__, bar.__context__.__context__)
... raise foo from bar
... except Exception as foo:
... wat = foo
...
foo None None
bar foo None
>>> print(wat, wat.__context__, wat.__context__.__context__)
foo bar None
>>> print(wat, wat.__cause__, wat.__cause__.__context__)
foo bar None
>>> print(wat, wat.__cause__, wat.__cause__.__cause__)
foo bar foo
here, between "raise foo from bar" and the end, bar.__context__ goes from foo
to None. since bar is only raised once, clearly in the context of foo (twice
over), I would expect bar.__context__ to stay foo.
--
messages: 300305
nosy: Christopher Stelma
priority: normal
severity: normal
status: open
title: __context__ reset to None in nested exception
type: behavior
versions: Python 3.6
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<http://bugs.python.org/issue31213>
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