python regexp从字符串中删除最后一个数字

Question

How can I remove the last digits from a string using python regexp or similar: I have an IP-address 10.121.100.200 and would want to only display 10.121.100. leaving out the last numbers.

Answer 1

Regex:

re.sub(r'\d+$', '', ip)

Without regexes

''.join(ip.rpartition('.')[:2])

Answer 2

>>> v = '10.121.100.200'
>>> ".".join(v.split('.')[0:-1])
'10.121.100'

If you want to leave the last little dot at the end, then:

>>> ".".join(v.split('.')[0:-1]) + '.'
'10.121.100.'

Just refactor it to a function, and you're good to go.

Answer 3

Another version

'{}.'.format('10.121.100.200'.rsplit('.', 1)[0])
'10.121.100.'