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bpo-40182: Remove the _field_types attribute of the NamedTuple class (GH-19368)

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Serhiy Storchaka 2020-04-05 00:43:20 +03:00 • committed by GitHub
parent 1b21573a89
commit 6fed3c8540
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5 changed files with 16 additions and 12 deletions
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6
Lib/typing.py
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@ -1705,9 +1705,7 @@ def _make_nmtuple(name, types):
msg = "NamedTuple('Name', [(f0, t0), (f1, t1), ...]); each t must be a type"
types = [(n, _type_check(t, msg)) for n, t in types]
nm_tpl = collections.namedtuple(name, [n for n, t in types])
# Prior to PEP 526, only _field_types attribute was assigned.
# Now __annotations__ are used and _field_types is deprecated (remove in 3.9)
nm_tpl.__annotations__ = nm_tpl._field_types = dict(types)
nm_tpl.__annotations__ = dict(types)
try:
nm_tpl.__module__ = sys._getframe(2).f_globals.get('__name__', '__main__')
except (AttributeError, ValueError):
@ -1717,7 +1715,7 @@ def _make_nmtuple(name, types):
# attributes prohibited to set in NamedTuple class syntax
_prohibited = {'__new__', '__init__', '__slots__', '__getnewargs__',
'_fields', '_field_defaults', '_field_types',
'_fields', '_field_defaults',
'_make', '_replace', '_asdict', '_source'}
_special = {'__module__', '__name__', '__annotations__'}