# test.py
import re

def find_number(s):
    """
    >>> find_number('Today is October 20, 2011.')
    ['20', '2011']
    """
    return re.compile('(\d+)').findall(s)

if __name__ == '__main__':
    import doctest
    module = __import__('test')
    print doctest.testmod(module)

程序输出：

TestResults(failed=0, attempted=1)