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47 lines
1.3 KiB
Python
47 lines
1.3 KiB
Python
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class Immutable(object):
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_mutable = False
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def __setattr__(self, name, value):
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if self._mutable or name == '_mutable':
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super(Immutable, self).__setattr__(name, value)
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else:
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raise TypeError("Can't modify immutable instance")
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def __delattr__(self, name):
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if self._mutable:
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super(Immutable, self).__delattr__(name)
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else:
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raise TypeError("Can't modify immutable instance")
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def __eq__(self, other):
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return hash(self) == hash(other)
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def __hash__(self):
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return hash(repr(self))
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def __repr__(self):
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return '%s(%s)' % (
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self.__class__.__name__,
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', '.join(['{0}={1}'.format(k, repr(v)) for k, v in self])
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)
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def __iter__(self):
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l = self.__dict__.keys()
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l.sort()
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for k in l:
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if not k.startswith('_'):
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yield k, getattr(self, k)
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@staticmethod
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def mutablemethod(f):
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def func(self, *args, **kwargs):
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if isinstance(self, Immutable):
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old_mutable = self._mutable
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self._mutable = True
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res = f(self, *args, **kwargs)
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self._mutable = old_mutable
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else:
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res = f(self, *args, **kwargs)
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return res
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return func
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