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Add OrderedDict support to collections.namedtuple().

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Raymond Hettinger 2009-03-02 22:28:31 +00:00
parent b62ad24cd8
commit a4f52b12d6
3 changed files with 16 additions and 10 deletions
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10
Lib/collections.py
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@ -149,7 +149,6 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
numfields = len(field_names)
argtxt = repr(field_names).replace("'", "")[1:-1] # tuple repr without parens or quotes
reprtxt = ', '.join('%s=%%r' % name for name in field_names)
dicttxt = ', '.join('%r: t[%d]' % (name, pos) for pos, name in enumerate(field_names))
template = '''class %(typename)s(tuple):
'%(typename)s(%(argtxt)s)' \n
__slots__ = () \n
@ -165,9 +164,9 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
return result \n
def __repr__(self):
return '%(typename)s(%(reprtxt)s)' %% self \n
def _asdict(t):
'Return a new dict which maps field names to their values'
return {%(dicttxt)s} \n
def _asdict(self):
'Return a new OrderedDict which maps field names to their values'
return OrderedDict(zip(self._fields, self)) \n
def _replace(self, **kwds):
'Return a new %(typename)s object replacing specified fields with new values'
result = self._make(map(kwds.pop, %(field_names)r, self))
@ -183,7 +182,8 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
# Execute the template string in a temporary namespace and
# support tracing utilities by setting a value for frame.f_globals['__name__']
namespace = dict(itemgetter=_itemgetter, __name__='namedtuple_%s' % typename)
namespace = dict(itemgetter=_itemgetter, __name__='namedtuple_%s' % typename,
OrderedDict=OrderedDict)
try:
exec(template, namespace)
except SyntaxError as e: