How can you extract the domain part from an email address in Python?

To extract the domain part from an email address in Python, split the string at the '@' character to separate the local part from the domain. For example: local, domain = email.split('@', 1). If you need only the top‑level domain (e.g., 'com' from 'example.com'), you can split the domain at the last '.' or use a simple approach: tld = domain.split('.')[-1]. The entire operation is O(n) where n is the length of the email string, because split scans the string once. This method works for standard email formats and is easy to understand. If you need to validate the email format, consider using the email.utils.parseaddr function or a library like validate_email. Example code: def get_domain(email): local, domain = email.split('@', 1); return domain. This returns 'example.com' for 'user@example.com'.