lines breaks a string up into a list of strings at newline
characters. The resulting strings do not contain newlines.
Note that after splitting the string at newline characters, the last
part of the string is considered a line even if it doesn't end with a
newline. For example,
>>> lines ""
[]
>>> lines "\n"
[""]
>>> lines "one"
["one"]
>>> lines "one\n"
["one"]
>>> lines "one\n\n"
["one",""]
>>> lines "one\ntwo"
["one","two"]
>>> lines "one\ntwo\n"
["one","two"]
Thus
lines s contains at least as many elements as
newlines in
s.