yield 求解

2013-03-19 02:32:50 154 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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def open_spider(self, spider, start_requests=None, close_if_idle=True):
print 'engine.open_spider open_spider()'
assert self.has_capacity(), "No free spider slots when opening %r" % \
spider.name
log.msg("Spider opened", spider=spider)
nextcall = CallLaterOnce(self._next_request, spider)
scheduler = self.scheduler_cls.from_settings(self.settings)
slot = Slot(start_requests or (), close_if_idle, nextcall, scheduler)
self.slots[spider] = slot
yield scheduler.open(spider)
print 'first yield ======'
yield self.scraper.open_spider(spider)
print 'second yield ======'
stats.open_spider(spider)
yield send_catch_log_deferred(signals.spider_opened, spider=spider)
print 'third yield ======'
slot.nextcall.schedule()

open_spider(-----)
这个时候会执行open_spider()函数体吗？

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