class SpiderError(RuntimeError):
    def __init__(self):
        super(SpiderError, self).__init__()
    def __str__(self):
        return "一个未知的爬虫错误"

class SpiderTaskTypeError(SpiderError):
    def __init__(self, task):
        super(SpiderTaskTypeError, self).__init__()
        self.task = task
    def __str__(self):
        return "Task的类型: %s 不受支持" % self.task

class SpiderNotFond(SpiderError):
    def __init__(self, id):
        super(SpiderNotFond, self).__init__()
        self.id = id
    def __str__(self):
        return "id: %s 的页面并不存在" % str(self.id)

class SpiderReFailed(SpiderError):
    def __init__(self, id, error):
        super(SpiderReFailed, self).__init__()
        self.id = id
        self.err = error
    def __str__(self):
        return "id: %s 的页面在正则识别id/title的时候出错, 具体错误如下:\n%s" % (str(self.id), str(self.err))