import numpy as np

battle_deaths = [[344, 2345], [253, 4345]]
deaths = np.array(battle_deaths)
deaths

deaths[0, 1]

deaths[:, 1]

deaths[1, :]

civilian_deaths = np.array([4352, 233, 3245, 256, 2394])
civilian_deaths

few_civ_deaths = np.where(civilian_deaths < 500)
few_civ_deaths

civ_deaths = civilian_deaths[few_civ_deaths]
civ_deaths