Complete and neaten-up namedtuple's replacement of builtin function lookups with derefs by rhettinger · Pull Request #11794 · python/cpython
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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]
repr_fmt = '(' + ', '.join(f'{name}=%r' for name in field_names) + ')'
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
Expand All @@ -414,7 +414,7 @@ def _make(cls, iterable): 'or iterable')
def _replace(_self, **kwds): result = _self._make(map(kwds.pop, field_names, _self)) result = _self._make(_map(kwds.pop, field_names, _self)) if kwds: raise ValueError(f'Got unexpected field names: {list(kwds)!r}') return result Expand All @@ -426,18 +426,15 @@ def __repr__(self): 'Return a nicely formatted representation string' return self.__class__.__name__ + repr_fmt % self
_dict, _zip = dict, zip
def _asdict(self): 'Return a new dict which maps field names to their values.' return _dict(_zip(self._fields, self))
def __getnewargs__(self): '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
for method in (__new__, _make.__func__, _replace, __repr__, _asdict, __getnewargs__): method.__qualname__ = f'{typename}.{method.__name__}' Expand Down
# Create all the named tuple methods to be added to the class namespace
Expand All @@ -414,7 +414,7 @@ def _make(cls, iterable): 'or iterable')
def _replace(_self, **kwds): result = _self._make(map(kwds.pop, field_names, _self)) result = _self._make(_map(kwds.pop, field_names, _self)) if kwds: raise ValueError(f'Got unexpected field names: {list(kwds)!r}') return result Expand All @@ -426,18 +426,15 @@ def __repr__(self): 'Return a nicely formatted representation string' return self.__class__.__name__ + repr_fmt % self
_dict, _zip = dict, zip
def _asdict(self): 'Return a new dict which maps field names to their values.' return _dict(_zip(self._fields, self))
def __getnewargs__(self): '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
for method in (__new__, _make.__func__, _replace, __repr__, _asdict, __getnewargs__): method.__qualname__ = f'{typename}.{method.__name__}' Expand Down