Domain name
Lesson 4 of 8 in Coddy's Email validator using Python course.
john@gmail.com
The bold part is the domain name.
The domain name is a string of letters and digits that defines a space on the Internet owned and controlled by a specific mailbox provider or organization.
Domain names may be a maximum of 253 characters and consist of:
- Uppercase and lowercase letters in English (A-Z, a-z)
- Digits from 0 to 9
- A hyphen (-)
- A period (.) (used to identify a sub-domain; for example, creator.coddy)
Challenge
EasyAdd to validate support for domain name validation.
In out validator we will support easier terms, the recipient name should be a maximum of 12 characters and minimum of 3 characters long and consist of:
- Uppercase and lowercase letters in English (A-Z, a-z)
- Digits from 0 to 9
- A hyphen (-)
As before the function validate should return true if the input email is valid, and now also with domain name validation
You don't need to support sub-domains, you can expect no domain name with a period (.) exists.
Try it yourself
PERMITS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789._'
def validate(email):
if not email.count('@') == 1:
return False
recipient_name = email.split('@')[0]
if len(recipient_name) > 24 or len(recipient_name) <= 3:
return False
for c in recipient_name:
if c not in PERMITS:
return False
if '.' == recipient_name[0] or '.' == recipient_name[-1] or '_' == recipient_name[0] or '_' == recipient_name[-1]:
return False
return True
