def test_view_failed_delitem(attr):
    adata = gen_adata((10, 10))
    view = adata[5:7, :][:, :5]
    adata_hash = joblib.hash(adata)
    view_hash = joblib.hash(view)

    with pytest.raises(KeyError):
        getattr(view, attr).__delitem__("not a key")

    assert view.is_view
    assert adata_hash == joblib.hash(adata)
    assert view_hash == joblib.hash(view)
def _search_not(self, base, search_filter, candidates=None):
        # Create empty candidates list as we need to use self.directory for
        # each search
        candidates = list()
        this_filter = list()

        index = 0
        search_filter.remove("!")
        for condition in search_filter:
            if not isinstance(condition, list):
                this_filter.append(condition)
            index +=1

        # Remove this_filter items from search_filter list
        for condition in this_filter:
            search_filter.remove(condition)

        try:
            search_filter = list(search_filter[0])
            for sub_filter in search_filter:
                if not isinstance(sub_filter, list):
                    candidates = self.operation.get(sub_filter)(base,
                                                                search_filter,
                                                                candidates)
                else:
                    candidates = self.operation.get(sub_filter[0])(base,
                                                                   sub_filter,
                                                                   candidates)
        except IndexError:
            pass

        candidates = self._invert_results(candidates)

        for item in this_filter:
            if ">=" in item:
                k, v = item.split(">=")
                candidates = Connection._match_less_than(base, k, v,
                                                            self.directory)
            elif "<=" in item:
                k, v = item.split("<=")
                candidates = Connection._match_greater_than(base, k, v,
                                                         self.directory)
            # Emulate AD functionality, same as "="
            elif "~=" in item:
                k, v = item.split("~=")
                candidates = Connection._match_notequal_to(base, k, v,
                                                         self.directory)
            elif "=" in item:
                k, v = item.split("=")
                candidates = Connection._match_notequal_to(base, k, v,
                                                         self.directory)
        return candidates