hrefタグ内のリンクを取得

Question

hrefタグ内のリンクを取得するにはどうすればよいですか？

page = urllib2.urlopen('https://www.meetup.com/') 
soup = BeautifulSoup(page, 'lxml') 

categories = soup.find('ul', class_='gridList') 

A = [] 
B = [] 

for category in categories.findAll('li'): 
    text = category.findAll('h4') 
    if len(text) != 0: 
     A.append(text[0].find(text = True)) 

for link in categories.findAll('li'): 
    url = link.findAll('a', href=True) 
    if len(url) != 0: 
     B.append(url) 

Answer 1

... 
(your code above)  
for link in categories.findAll('li'): 
    url = link.find('a', href=True) 
    if len(url) != 0: 
     B.append(url['href'])