Eric Snow added the comment:
> I'm sorry, but this seems like it should be an importlib internal
> affair. The new exception is too much in everyone's face, because
> the exception name gets printed on every traceback.
That's the crux of the issue. If there isn't much utility outside importlib to
distinguishing between module-not-found and other causes of ImportError, then
there isn't much point to a new exception. It just boils down to what the
other potential causes of ImportError are and how much people care about them.
I keep thinking about PEP 3151 (IOError/OSError hierarchy rework) and the
lessons we've learned about exception attributes vs. subclasses. For
readability and write-ability, I'd rather write this:
try:
from _collections import OrderedDict
except ModuleNotFoundError:
pass
than this:
try:
from _collections import OrderedDict
except ImportError as e:
if e.reason is not importlib.machinery.ImportReason.MODULE_NOT_FOUND:
raise
But the relevant question is, what is the benefit (outside importlib) of either
over this:
try:
from _collections import OrderedDict
except ImportError:
pass
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<http://bugs.python.org/issue15767>
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