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Complete and neaten-up namedtuple's replacement of builtin function lookups with derefs (GH-11794)

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Raymond Hettinger 2019-02-08 10:37:39 -08:00 committed by Miss Islington (bot)
parent d9503c307a
commit 64360ada0f
1 changed files with 3 additions and 6 deletions
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9
Lib/collections/__init__.py
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@ -390,7 +390,7 @@ def namedtuple(typename, field_names, *, rename=False, defaults=None, module=Non
arg_list = repr(field_names).replace("'", "")[1:-1] arg_list = repr(field_names).replace("'", "")[1:-1]
repr_fmt = '(' + ', '.join(f'{name}=%r' for name in field_names) + ')' repr_fmt = '(' + ', '.join(f'{name}=%r' for name in field_names) + ')'
tuple_new = tuple.__new__ tuple_new = tuple.__new__
_len = len _dict, _tuple, _len, _map, _zip = dict, tuple, len, map, zip
# Create all the named tuple methods to be added to the class namespace # Create all the named tuple methods to be added to the class namespace
@ -414,7 +414,7 @@ def namedtuple(typename, field_names, *, rename=False, defaults=None, module=Non
'or iterable') 'or iterable')
def _replace(_self, **kwds): def _replace(_self, **kwds):
result = _self._make(map(kwds.pop, field_names, _self)) result = _self._make(_map(kwds.pop, field_names, _self))
if kwds: if kwds:
raise ValueError(f'Got unexpected field names: {list(kwds)!r}') raise ValueError(f'Got unexpected field names: {list(kwds)!r}')
return result return result
@ -426,18 +426,15 @@ def namedtuple(typename, field_names, *, rename=False, defaults=None, module=Non
'Return a nicely formatted representation string' 'Return a nicely formatted representation string'
return self.__class__.__name__ + repr_fmt % self return self.__class__.__name__ + repr_fmt % self
_dict, _zip = dict, zip
def _asdict(self): def _asdict(self):
'Return a new dict which maps field names to their values.' 'Return a new dict which maps field names to their values.'
return _dict(_zip(self._fields, self)) return _dict(_zip(self._fields, self))
def __getnewargs__(self): def __getnewargs__(self):
'Return self as a plain tuple. Used by copy and pickle.' 'Return self as a plain tuple. Used by copy and pickle.'
return tuple(self) return _tuple(self)
# Modify function metadata to help with introspection and debugging # Modify function metadata to help with introspection and debugging
for method in (__new__, _make.__func__, _replace, for method in (__new__, _make.__func__, _replace,
__repr__, _asdict, __getnewargs__): __repr__, _asdict, __getnewargs__):
method.__qualname__ = f'{typename}.{method.__name__}' method.__qualname__ = f'{typename}.{method.__name__}'