Matthias Bussonnier added the comment:
I'm unsure I understand changing only the default __str__() method. You will
anyway have to format the message differently depending on whether you raise
from a from-import or a from-import-* or any other locations.
AFAIU you "just" need the following
- PyErr_SetImportError(PyUnicode_FromFormat("cannot import name %R",
name), pkgname, pkgpath);
+ PyErr_SetImportError(
+ PyUnicode_FromFormat("cannot import name %R from %R (%S)",
+ name, pkgname, pkgpath),
+ pkgname, pkgpath);
To use Barry format (though keeping quotes around identifiers to match current
behavior).
(And similar if path is null).
I'm unsure if you meant to provide a set of "format-template" to ImportError
that are guarantied to be called with format(name=..., path=...) but I doubt it.
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<http://bugs.python.org/issue29546>
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