partition string in python and get value of last segment after colon

result = mystring.rpartition(':')[2]

If you string does not have any :, the result will contain the original string.

An alternative that is supposed to be a little bit slower is:

result = mystring.split(':')[-1]

Use this:

"client:user:username:type:1234567".split(":")[-1]

foo = "client:user:username:type:1234567"
last = foo.split(':')[-1]