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# See <http://docs.python.org/ref/sequence-types.html> # # For a sequence, the allowable keys should be the integers k for which # 0 <= k < N where N is the length of the sequence, or slice objects, # which define a range of items. class MySequence: def __len__(self): """Called to implement the built-in function len(). Should return the length of the object, an integer >= 0. Also, an object that doesn't define a __nonzero__() method and whose __len__() method returns zero is considered to be false in a Boolean context.""" pass def __getitem__(self,key): """Called to implement evaluation of self[key]. For sequence types, the accepted keys should be integers and slice objects. Note that the special interpretation of negative indexes (if the class wishes to emulate a sequence type) is up to the __getitem__() method. If key is of an inappropriate type, TypeError may be raised; if of a value outside the set of indexes for the sequence (after any special interpretation of negative values), IndexError should be raised. For mapping types, if key is missing (not in the container), KeyError should be raised. Note: for loops expect that an IndexError will be raised for illegal indexes to allow proper detection of the end of the sequence.""" pass def __setitem__(self,key,value): """Called to implement assignment to self[key]. Same note as for __getitem__(). This should only be implemented for mappings if the objects support changes to the values for keys, or if new keys can be added, or for sequences if elements can be replaced. The same exceptions should be raised for improper key values as for the __getitem__() method.""" pass def __delitem__(self,key): """Called to implement deletion of self[key]. Same note as for __getitem__(). This should only be implemented for mappings if the objects support removal of keys, or for sequences if elements can be removed from the sequence. The same exceptions should be raised for improper key values as for the __getitem__ () method.""" pass # __iter__ is not strictly required, it's only needed to implement # efficient iteration. def __iter__(self): """This method is called when an iterator is required for a container. This method should return a new iterator object that can iterate over all the objects in the container. For mappings, it should iterate over the keys of the container, and should also be made available as the method iterkeys().""" pass # __contains__ isn't strictly required either, it's only needed to # implement the `in` operator efficiently. def __contains__(self,item): """Called to implement membership test operators. Should return true if item is in self, false otherwise. For mapping objects, this should consider the keys of the mapping rather than the values or the key-item pairs.""" pass # Mutable sequences only, provide the Python list methods. def append(self,item): pass def count(self): pass def index(self,item): pass def extend(self,other): pass def insert(self,item): pass def pop(self): pass def remove(self,item): pass def reverse(self): pass def sort(self): pass # If you want to support addition and multiplication provide the # methods __add__(), __radd__(), __iadd__(), __mul__(), __rmul__() # and __imul__().