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|
try:
from __pypy__ import identity_dict as idict
except ImportError:
idict = None
from collections import MutableMapping
class IdentityDictPurePython(MutableMapping):
__slots__ = "_dict _keys".split()
def __init__(self):
self._dict = {}
self._keys = {} # id(obj) -> obj
def __getitem__(self, arg):
return self._dict[id(arg)]
def __setitem__(self, arg, val):
self._keys[id(arg)] = arg
self._dict[id(arg)] = val
def __delitem__(self, arg):
del self._keys[id(arg)]
del self._dict[id(arg)]
def __iter__(self):
return self._keys.itervalues()
def __len__(self):
return len(self._keys)
def __contains__(self, arg):
return id(arg) in self._dict
def copy(self):
d = type(self)()
d.update(self.iteritems())
assert len(d) == len(self)
return d
class IdentityDictPyPy(MutableMapping):
def __init__(self):
self._dict = idict()
def __getitem__(self, arg):
return self._dict[arg]
def __setitem__(self, arg, val):
self._dict[arg] = val
def __delitem__(self, arg):
del self._dict[arg]
def __iter__(self):
return iter(self._dict.keys())
def __len__(self):
return len(self._dict)
def __contains__(self, arg):
return arg in self._dict
def copy(self):
d = type(self)()
d.update(self.iteritems())
assert len(d) == len(self)
return d
def __nonzero__(self):
return bool(self._dict)
if idict is None:
identity_dict = IdentityDictPurePython
else:
identity_dict = IdentityDictPyPy
|
