class Bean:
    def __init__(self, cool):
        self.cool = cool


def we_cool(beans):
    for bean in beans:
        if not bean.cool:
            print 'Not cool.'
            return False
    print 'We cool.'
    return True


beans = [Bean(True), Bean(False)]
we_cool(beans)

beans[1].cool = True
we_cool(beans)