Currently,contextlib.suppress does not successfully suppress exceptions that are wrapped within anExceptionGroup.

In other words, this works:

defraise_ve():raiseValueError("ve")withsuppress(ValueError):raise_ve()

while this doesn't:

defraise_ve_eg():raiseExceptionGroup("eg", [ValueError("ve")])withsuppress(ValueError):raise_ve_eg()

The user's intent is to suppress the latter case, too. It should work just as well, removingValueError instances from the exception group. If it ends up empty, nothing gets raised. Otherwise, anExceptionGroup should be re-raised with the remaining exceptions. For instance:

defraise_ve_eg3():raiseExceptionGroup("eg", [ValueError("ve1"),KeyError("ke"),ValueError("ve2")])withsuppress(ValueError):raise_ve_eg3()

should raise anExceptionGroup with theKeyError("ke") only, as we suppressed ValueError instances.

Linked PRs

• gh-103791: Make contextlib.suppress also act on exceptions within an ExceptionGroup #103792
• gh-103791: handleBaseExceptionGroup incontextlib.suppress() #111910
• [3.12] gh-103791: handleBaseExceptionGroup incontextlib.suppress() (GH-111910) #111955