In [1]:

    

# Import modules
import numpy as np


    

In [2]:

    

# Create a 2x2 array
battle_deaths = [[344, 2345], [253, 4345]]
deaths = np.array(battle_deaths)
deaths


    

    
Out[2]:





array([[ 344, 2345],
       [ 253, 4345]])

In [3]:

    

# Select the top row, second item
deaths[0, 1]


    

    
Out[3]:





2345

In [4]:

    

# Select the second column
deaths[:, 1]


    

    
Out[4]:





array([2345, 4345])

In [5]:

    

# Select the second row
deaths[1, :]


    

    
Out[5]:





array([ 253, 4345])

In [6]:

    

# Create an array of civilian deaths
civilian_deaths = np.array([4352, 233, 3245, 256, 2394])
civilian_deaths


    

    
Out[6]:





array([4352,  233, 3245,  256, 2394])

In [7]:

    

# Find the index of battles with less than 500 deaths
few_civ_deaths = np.where(civilian_deaths < 500)
few_civ_deaths


    

    
Out[7]:





(array([1, 3]),)

In [8]:

    

# Find the number of civilian deaths in battles with less than 500 deaths
civ_deaths = civilian_deaths[few_civ_deaths]
civ_deaths


    

    
Out[8]:





array([233, 256])