I was going to submit an answer but it would have to import a module (which is built-in to Python). This makes my answer two-lined, because of the import. Is this acceptable?
Of course it is acceptable. :)
Your answer can span as many lines as you like (in fact, there are many languages used around here where most programs have to span multiple lines). Just add the required linefeeds to your byte count. Simple example:
foo bar baz
Would be 11 bytes. (Unless the program requires a trailing linefeed as well, in which case it would be 12 bytes, but I don't think you'll have to worry about that in Python.)