Using Numpy example. Records of weekly weather temperatures. More at www.numpy.org.

numpy_example.py

import numpy as np

#Get data from CSV 
#Temperatures recorded 4 times a day, at 0:00, 6:00, 12:00, and 18:00. Last weeks data (Monday through Friday)
temperatures = np.genfromtxt('temperature_data.csv', delimiter=',')

#Adjust temperatures
temperatures_fixed = temperatures + 3.0

#Select Monday's Temperatures
monday_temperatures = temperatures_fixed[0,:]

#Select Thursday / Friday Temperatures
thursday_friday_morning = temperatures_fixed[3:,1]

#Select Extremes
temperature_extremes = temperatures_fixed[(temperatures_fixed < 50) | (temperatures_fixed > 60)]

#Print data
print(temperature_extremes)