import requests
import bs4

res = requests.get('https://www.google.com/search?q=siamese algae eater liveaquaria')
res.raise_for_status()
soup = bs4.BeautifulSoup(res.text,"html.parser")
linkElems = soup.select('.r a')
#Select first result, structure is set to get more than 1 result
numOpen = min(1, len(linkElems))
for i in range(numOpen):
    url = linkElems[i].get('href')
    print (url)