NameError: name 'download' is not defined

[ntdropper]

I am trying to extract the country area from example website. And I got following errors. I am using python version 3.6

from bs4 import BeautifulSoup
url = 'http://example.webscraping.com/places/default/view/Australia-14'
html = download(url)
soup = BeautifulSoup(html)
# locate the area row
tr = soup.find(attrs={'id':'places_area_row'})
td = tr.find(attrs={'class':'w2p_fw'}) #locate the date elements
area = td.text #extract the text form the data element
print (area)

Error: "NameError: name 'download' is not defined"