nosetester.py 文件源码

def import_nose():
    """ Import nose only when needed.
    """
    fine_nose = True
    minimum_nose_version = (1, 0, 0)
    try:
        import nose
    except ImportError:
        fine_nose = False
    else:
        if nose.__versioninfo__ < minimum_nose_version:
            fine_nose = False

    if not fine_nose:
        msg = ('Need nose >= %d.%d.%d for tests - see '
               'http://somethingaboutorange.com/mrl/projects/nose' %
               minimum_nose_version)
        raise ImportError(msg)

    return nose