pandas,numpy ，np.logical_and,or,not

# Import cars data

import pandas as pd

cars = pd.read_csv('cars.csv', index_col = 0)

# Import numpy, you'll need this

import numpy as np

# Create medium: observations with cars_per_cap between 100 and 500

cars_per_cap = cars['cars_per_cap']

medium = np.logical_and(cars_per_cap>100,cars_per_cap<500)

# Print medium

print(cars[medium])