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Mark Pilgrim
232 lines
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232 lines
5.1 KiB
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<title>Special Method Names - Dive into Python 3</title>
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<p>You are here: <a href=index.html>Home</a> <span>‣</span> <a href=table-of-contents.html#special-method-names>Dive Into Python 3</a> <span>‣</span>
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<p id=level title=advanced>Difficulty level: <span>♦</span><span>♦</span><span>♦</span><span>♦</span><span>♢</span>
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<h1>Special Method Names</h1>
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<blockquote class=q>
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<p><span>❝</span> FIXME <span>❞</span><br>— FIXME
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</blockquote>
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<p id=toc>
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<h2 id=divingin>Diving In</h2>
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<p class=f>FIXME
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<p class=d>[<a href=examples/ordereddict.py>download <code>ordereddict.py</code></a>]
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<pre><code>import collections
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import itertools
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class OrderedDict(dict, collections.MutableMapping):
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def __init__(self, *args, **kwds):
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if len(args) > 1:
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raise TypeError('expected at most 1 arguments')
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if not hasattr(self, '_keys'):
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self._keys = []
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self.update(*args, **kwds)
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def clear(self):
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del self._keys[:]
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dict.clear(self)
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def __setitem__(self, key, value):
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if key not in self:
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self._keys.append(key)
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dict.__setitem__(self, key, value)
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def __delitem__(self, key):
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dict.__delitem__(self, key)
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self._keys.remove(key)
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def __iter__(self):
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return iter(self._keys)
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def __reversed__(self):
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return reversed(self._keys)
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def popitem(self):
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if not self:
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raise KeyError('dictionary is empty')
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key = self._keys.pop()
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value = dict.pop(self, key)
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return key, value
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def __reduce__(self):
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items = [[k, self[k]] for k in self]
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inst_dict = vars(self).copy()
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inst_dict.pop('_keys', None)
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return (self.__class__, (items,), inst_dict)
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setdefault = MutableMapping.setdefault
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update = MutableMapping.update
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pop = MutableMapping.pop
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keys = MutableMapping.keys
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values = MutableMapping.values
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items = MutableMapping.items
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def __repr__(self):
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if not self:
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return '%s()' % (self.__class__.__name__,)
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return '%s(%r)' % (self.__class__.__name__, list(self.items()))
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def copy(self):
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return self.__class__(self)
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@classmethod
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def fromkeys(cls, iterable, value=None):
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d = cls()
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for key in iterable:
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d[key] = value
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return d
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def __eq__(self, other):
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if isinstance(other, OrderedDict):
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return all(p==q for p, q in itertools.zip_longest(self.items(), other.items()))
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return dict.__eq__(self, other)</code></pre>
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<!--
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Basics:
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__init__
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__repr__
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__str__
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__bytes__ (*)
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__format__
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Rich comparisons:
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__lt__
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__le__
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__eq__
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__ne__
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__gt__
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__ge__
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__bool__
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__cmp__ (*)
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Custom attributes:
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__getattr__
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__getattribute__
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__setattr__
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__delattr__
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__dir__
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Acts like a function:
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__call__
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Acts like a list:
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__len__
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__reversed__
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__contains__
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__index__
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__getslice__ (*)
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Acts like a dictionary:
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__getitem__
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__setitem__
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__delitem__
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__missing__ (*)
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Acts like an iterator:
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__iter__ (*)
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__next__ (*)
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Acts like a number:
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__add__
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__sub__
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__mul__
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__truediv__
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__floordiv__
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__mod__
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__divmod__
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__pow__
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__lshift__
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__rshift__
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__and__
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__xor__
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__or__
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__radd__
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__rsub__
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__rmul__
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__rtruediv__
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__rfloordiv__
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__rmod__
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__rpow__
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__rlshift__
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__rrshift__
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__rand__
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__rxor__
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__ror__
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__iadd__
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__isub__
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__imul__
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__itruediv__
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__ifloordiv__
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__imod__
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__ipow__
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__ilshift__
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__irshift__
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__iand__
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__ixor__
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__ior__
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__neg__
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__pos__
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__abs__
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__invert__
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__complex__
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__int__
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__float__
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__long__ (*)
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__round__
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__ceil__ (*)
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__floor__ (*)
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__trunc__ (*)
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Support for pickling, see http://docs.python.org/3.0/library/pickle.html:
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__copy__ (*)
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__deepcopy__ (*)
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__getnewargs__ (*)
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__getinitargs__ (*)
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__getstate__ (*)
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__setstate__ (*)
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__reduce__ (*)
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__reduce_ex__ (*)
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Really weird stuff:
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__new__
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__del__
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__slots__
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__hash__
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__get__
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__set__
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__delete__
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__enter__ see http://docs.python.org/3.0/library/stdtypes.html#typecontextmanager
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__exit__
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__subclasshook__ (*) see http://docs.python.org/3.0/library/abc.html
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__instancecheck__ (*) see http://www.ibm.com/developerworks/linux/library/l-python3-2/
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__subclasscheck__ (*)
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-->
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<p class=nav><a rel=prev class=todo><span>☜</a> <a rel=next class=todo><span>☞</span></a>
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<p class=c>© 2001–9 <a href=about.html>Mark Pilgrim</a>
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