<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def select_from_drop_down_by_locator(self, drop_down_locator, option_locator, params=None):
 """ Select option from drop down widget using locator. :param drop_down_locator: locator tuple or WebElement instance :param option_locator: locator tuple or WebElement instance :param params: Dictionary containing dictionary of params :return: None """

        # Open/activate drop down
        self.click(drop_down_locator, params['drop_down'] if params else None)

        # Click option in drop down
        self.click(option_locator, params['option'] if params else None)