Object-Oriented Programming in Java

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6 Object-Oriented Programming
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def __setitem__(self, index, value): raise TypeError("use add() to insert a value and rely on " "the list to put it in the right place")
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We don t want the user to change an item at a given index position (so L[n] = x is disallowed); otherwise, the sorted list s order might be invalidated The TypeError exception is the one used to signify that an operation is not supported by a particular data type
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def __iter__(self): return iter(self__list)
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This method is easy to implement since we can just return an iterator to the private list using the built-in iter() function This method is used to support the for value in iterable syntax Note that if a sequence is required it is this method that is used So to convert a SortedList, L, to a plain list we can call list(L), and behind the scenes Python will call SortedList__iter__(L) to provide the sequence that the list() function requires
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def __reversed__(self): return reversed(self__list)
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This provides support for the built-in reversed() function so that we can write, for example, for value in reversed(iterable)
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def __contains__(self, value): index = self__bisect_left(value) return (index < len(self__list) and self__list[index] == value)
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The __contains__() method provides support for the in operator Once again we are able to use a fast binary search rather than the slow linear search used by a plain list
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def clear(self): self__list = [] def pop(self, index=-1): return self__listpop(index) def __len__(self): return len(self__list) def __str__(self): return str(self__list)
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The SortedListclear() method discards the existing list and replaces it with a new empty list The SortedListpop() method removes and returns the item at the given index position, or raises an IndexError exception if the index is out of range For the pop(), __len__(), and __str__() methods, we simply pass on the work to the aggregated self__list object We do not reimplement the __repr__() special method, so the base class object__repr__() will be called when the user writes repr(L) and L is a SortedList This will produce a string such as '<SortedListSortedList object at 0x97e7cec>', although the hexadecimal ID will vary, of course We cannot provide a sensible __repr__() implementation because we would need to give the key function and we cannot represent a function object reference as an eval()-able string We have not implemented the insert(), reverse(), or sort() method because none of them is appropriate If any of them are called an AttributeError exception will be raised If we copy a sorted list using the L[:] idiom we will get a plain list object, rather than a SortedList The easiest way to get a copy is to import the copy module and use the copycopy() function this is smart enough to copy a sorted list (and instances of most other custom classes) without any help However, we have decided to provide an explicit copy() method:
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def copy(self): return SortedList(self, self__key)
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By passing self as the rst argument we ensure that self__list is simply shallow-copied rather than being copied and re-sorted (This is thanks to the __init__() method s type-testing elif clause) The theoretical performance advantage of copying this way is not available to the copycopy() function, but we can easily make it available by adding this line:
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__copy__ = copy
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When copycopy() is called it tries to use the object s __copy__() special method, falling back to its own code if one isn t provided With this line in place copycopy() will now use the SortedListcopy() method for sorted lists (It is also possible to provide a __deepcopy__() special method, but this is slightly more involved the copy module s online documentation has the details) We have now completed the implementation of the SortedList class In the next subsection we will make use of a SortedList to provide a sorted list of keys for the SortedDict class
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