Hello,
googling I found several ways of implementing a "dictionary with
attribute-style access".
1. ActiveState cookbook: http://code.activestate.com/recipes/473786/
2. ActiveState cookbook:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/361668
3. web2py codebase: Storage(dict)
I enclosed the three implementations below.
My question to the Python specialists: which one is the most correct?
Are there restrictions with regards to pickling or copy()?
Which one should I choose?
Regards, Andreas
--
Andreas Balogh
baloand (at) gmail.com
-----------------------------------------------------------------------
class AttrDict(dict):
""" comments removed """
"""A dictionary with attribute-style access. It maps attribute
access to the real dictionary. """
def __init__(self, init={}):
dict.__init__(self, init)
def __getstate__(self):
return self.__dict__.items()
def __setstate__(self, items):
for key, val in items:
self.__dict__[key] = val
def __repr__(self):
return "%s(%s)" % (self.__class__.__name__, dict.__repr__(self))
def __setitem__(self, key, value):
return super(AttrDict, self).__setitem__(key, value)
def __getitem__(self, name):
return super(AttrDict, self).__getitem__(name)
def __delitem__(self, name):
return super(AttrDict, self).__delitem__(name)
__getattr__ = __getitem__
__setattr__ = __setitem__
def copy(self):
ch = AttrDict(self)
return ch
-----------------------------------------------------------------------
class attrdict(dict):
""" comments removed """
def __init__(self, *args, **kwargs):
dict.__init__(self, *args, **kwargs)
self.__dict__ = self
-----------------------------------------------------------------------
class Storage(dict):
""" comments removed """
def __getattr__(self, key):
try:
return self[key]
except KeyError, k:
return None
def __setattr__(self, key, value):
self[key] = value
def __delattr__(self, key):
try:
del self[key]
except KeyError, k:
raise AttributeError, k
def __repr__(self):
return '<Storage ' + dict.__repr__(self) + '>'
def __getstate__(self):
return dict(self)
def __setstate__(self, value):
for (k, v) in value.items():
self[k] = v
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