__init__.py 文件源码

def __setitem__(self, item, value):
        '''
        Set one or more items using flexible indexing.

        The slice and int syntax (including int in the tuple/list syntax) can
        only be used to change values of existing keys, rather than set values
        for new keys.
        '''
        item2, single = convert_index_to_keys(self, item)
        super_setitem = super(IndexDict, self).__setitem__
        if single:
            super_setitem(item2, value)
        else:
            if len(item2) != len(value):
                raise ValueError(
                    'Number of keys (%s) based on argument %s does not match '
                    'number of values (%s)' % (len(item2), item, len(value)))
            map(IndexDict_check_key_type, item2)
            return map(super_setitem, item2, value)