Context managers for controlling exception chaining.
Project description
Provides a different way of controlling exception chaining (the implicit __context__ and explicit __cause__) beyond just raise ... from ....
Versioning
This library’s version numbers follow the SemVer 2.0.0 specification.
Installation
pip install exceptioncontext
Usage
Import as needed:
from exceptioncontext import cause, context, suppress_context
Explicitly chain exception (set __cause__):
with cause(Exception("foo")):
raise Exception("bar")
Override implicitly chained exception (set __context__):
with context(Exception("foo")):
raise Exception("bar")
Manually control context suppression (set __suppress_context__):
with suppress_context(False):
raise Exception("foo")
Reduce repetition in code like
if some_condition:
raise SomeError("foo") from earlier_exception
elif other_condition:
raise OtherError("bar") from earlier_exception
else:
raise Exception("qux") from earlier_exception
by turning it into
with context(earlier_exception):
if some_condition:
raise SomeError("foo")
elif other_condition:
raise OtherError("bar")
else:
raise Exception("qux")
You now have more freedom in refactoring exception logic, because chaining is fully independent of the raise statement, and freely composable with other code:
with cause(earlier_exception):
helper_function_to_which_might_raise_an_exception()
Portability
Portable to all releases of both Python 3 and Python 2.
(The oldest tested is 2.5, but it will likely work on all Python 2 versions and probably on even earlier versions, when paired with something like with-as-a-function.)
On implementations of Python where setting the exception chaining attributes on an exception raises an AttributeError, exceptioncontext gracefully degrades to doing nothing.
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