Python：如何在固定字符串中的特定字符之前排除一组字符

Question

Using a python script I want to exclude all characters at and before the '@' from the userlist*. I only want to see the full domain names. I have tried achieving this using regex, replace, substrings, custom functions etc... but nothing is generating the output I need. I feel like I'm looking In the wrong direction and I must be missing something simple.

* Userlist:

user@domain.com
anotheruser@somedomain.org
superuser@domains.co.uk
foo@domain.com

Answer 1

email = 'user@domain.com'
_, domain = email.split('@')
print domain

>>> domain.com

Answer 2

For completeness, here is (a) solution using regular expressions:

>>> import re    
>>> re.search(r'(?<=@).*', 'me@example.com').group()
'example.com'

Answer 3

As an alternative to split() you can slice the index as follows

email = 'user@domain.com'
domain = email[email.index['@']+1:]
print domain

>>> domain.com

Answer 4

This is a slightly safer version of @chishaku's answer; it returns everything following the first occurrence of the target character or substring, and will not choke on 0 or multiple occurrences.

def after_first(ch, s):
    return s.split(ch, 1)[-1]

for user in userlist:
    print after_first("@", user)