Find most common email domains

common_domains.py

from collections import defaultdict
from collections import Counter

emails = User.objects.values_list('email', flat=True)
domains = defaultdict(int)
for email in emails:
    try:
        domain = email.split('@')[1]
        domains[domain] += 1
    except:
        pass

counter = Counter(domains)
counter.most_common(20)