clear= Select(driver.find_element_by_id('bld_grp'))
clear.deselect_by_index('4')
#Importing Select Library
from selenium.webdriver.support.select import Select
# First Select ID of drop-down
select_list=Select(driver.find_element_by_id('bld_grp'))
# select by visible text
select_list.select_by_visible_text('O type')