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bpo-40277: Add a repr() to namedtuple's _tuplegetter to aid with introspection (GH-19537)

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Ammar Askar 2020-04-14 23:36:08 -07:00 committed by GitHub
parent 4f98f465f1
commit a86b522d8f
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 23 additions and 1 deletions
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12
Lib/test/test_collections.py
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@ -411,6 +411,18 @@ class TestNamedTuple(unittest.TestCase):
self.assertIs(P.m.__doc__, Q.o.__doc__)
self.assertIs(P.n.__doc__, Q.p.__doc__)
@support.cpython_only
def test_field_repr(self):
Point = namedtuple('Point', 'x y')
self.assertEqual(repr(Point.x), "_tuplegetter(0, 'Alias for field number 0')")
self.assertEqual(repr(Point.y), "_tuplegetter(1, 'Alias for field number 1')")
Point.x.__doc__ = 'The x-coordinate'
Point.y.__doc__ = 'The y-coordinate'
self.assertEqual(repr(Point.x), "_tuplegetter(0, 'The x-coordinate')")
self.assertEqual(repr(Point.y), "_tuplegetter(1, 'The y-coordinate')")
def test_name_fixer(self):
for spec, renamed in [
[('efg', 'g%hi'), ('efg', '_1')], # field with non-alpha char

2
Misc/NEWS.d/next/Library/2020-04-14-21-53-18.bpo-40277.NknSaf.rst Normal file
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@ -0,0 +1,2 @@
:func:`collections.namedtuple` now provides a human-readable repr for its
field accessors.

10
Modules/_collectionsmodule.c
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@ -2493,6 +2493,14 @@ tuplegetter_reduce(_tuplegetterobject *self, PyObject *Py_UNUSED(ignored))
return Py_BuildValue("(O(nO))", (PyObject*) Py_TYPE(self), self->index, self->doc);
}
static PyObject*
tuplegetter_repr(_tuplegetterobject *self)
{
return PyUnicode_FromFormat("%s(%zd, %R)",
_PyType_Name(Py_TYPE(self)),
self->index, self->doc);
}
static PyMemberDef tuplegetter_members[] = {
{"__doc__", T_OBJECT, offsetof(_tuplegetterobject, doc), 0},
@ -2515,7 +2523,7 @@ static PyTypeObject tuplegetter_type = {
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
0, /* tp_repr */
(reprfunc)tuplegetter_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */