New submission from Walter Dörwald:
When an exception is raised by inspect.Signature.bind() in some cases the
exception has a StopIteration as its __context__:
import inspect
try:
inspect.signature(lambda x:None).bind()
except Exception as exc:
print(repr(exc))
print(repr(exc.__context__))
This prints:
TypeError("missing a required argument: 'x'",)
StopIteration()
I would have expected it to print:
TypeError("missing a required argument: 'x'",)
None
This reason for this is that the code in bind() has nested exception handlers.
The innermost handler does
raise TypeError(...) from None
to drop the exception context, but another context exception gets added by the
outermost exception handler.
----------
messages: 245506
nosy: doerwalter
priority: normal
severity: normal
status: open
title: Accidental exception chaining in inspect.Signature.bind()
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Python tracker <[email protected]>
<http://bugs.python.org/issue24474>
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