import re


def get_sentences(paragraph):
    """Returns a list of sentences from a paragraph

    This is a rather naive implementation; there are probably better ones out there
    Assumes that the paragraph has proper punctuation.
    """
    punctuation = re.compile(r'[\.!?]')
    sentences = [sentence.strip() for sentence in punctuation.split(paragraph)]
    sentences = filter(lambda x: x, sentences)
    return sentences