how to split text into lines?

[kj]

In Perl, one can break a chunk of text into an array of lines while
preserving the trailing line-termination sequence in each line, if
any, by splitting the text on the regular expression /^/:

  DB<1> x split(/^/, "foo\nbar\nbaz")
0  'foo
'
1  'bar
'
2  'baz'

But nothing like this seems to work in Python:

>>> re.split('^', 'foo\nbar\nbaz')
['foo\nbar\nbaz']

(One gets the same result if one adds the re.MULTILINE flag to the
re.split call.)

What's the Python idiom for splitting text into lines, preserving
the end-of-line sequence in each line?
-- 
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.