def get_tools(self, sheet_name, range_info):
        """returns the list of list of tools."""
        tool_col = range_info["tools"]
        tool_value_range = self._get_numeric_range(range_info, tool_col, tool_col)
        tool_value_range = "!".join([sheet_name, tool_value_range])
        _ = self.api.values.GET(tool_value_range).json()
        tools_names = _["values"]
        r_names = []
        for i, tools in enumerate(tools_names):
            if len(tools) > 0:
                tools = tools[0].split(",")
                tools = [t.strip() for t in tools]
                tools = list(set(tools))
                while "" in tools:
                    tools.remove("")
            r_names.append(tools)
        return r_names
returns the list of list of tools.
contrib/feeds/threattracking/threattracking.py