scrapy RuntimeError: maximum recursion depth exceeded while calling a Python object 超出python最大递归数异常

2019-10-21 19:01:00 [scrapy.core.engine] INFO: Spider opened
2019-10-21 19:01:00 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2019-10-21 19:01:00 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6023
2019-10-21 19:01:01 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://amp-api-search-edge.apps.apple.com/v1/catalog/cn/search?term=%E7%AE%A1%E8%B4%A6&platform=iphone&include=apps,top-apps&bubble[search]=apps,developers,groupings,editorial-items,app-bundles,in-apps&l=zh-Hans-CN&extend=editorialBadgeInfo,messagesScreenshots,minimumOSVersion,requiredCapabilities,screenshotsByType,supportsFunCamera,videoPreviewsByType> (referer: None)
2019-10-21 19:01:01 [scrapy.core.scraper] DEBUG: Scraped from <200 https://amp-api-search-edge.apps.apple.com/v1/catalog/cn/search?term=%E7%AE%A1%E8%B4%A6&platform=iphone&include=apps,top-apps&bubble[search]=apps,developers,groupings,editorial-items,app-bundles,in-apps&l=zh-Hans-CN&extend=editorialBadgeInfo,messagesScreenshots,minimumOSVersion,requiredCapabilities,screenshotsByType,supportsFunCamera,videoPreviewsByType>
None
2019-10-21 19:01:01 [scrapy.core.engine] INFO: Closing spider (finished)
Traceback (most recent call last):
File "/usr/lib/python2.7/logging/__init__.py", line 861, in emit
msg = self.format(record)
File "/usr/lib/python2.7/logging/__init__.py", line 734, in format
return fmt.format(record)
File "/usr/lib/python2.7/logging/__init__.py", line 465, in format
record.message = record.getMessage()
File "/usr/lib/python2.7/logging/__init__.py", line 329, in getMessage
msg = msg % self.args
File "/home/project/release/venv2.7/local/lib/python2.7/site-packages/scrapy/spiders/__init__.py", line 107, in __str__
return "<%s %r at 0x%0x>" % (type(self).__name__, self.name, id(self))
...... 重复n行红色日志 .......
File "/home/project/release/venv2.7/local/lib/python2.7/site-packages/scrapy/spiders/__init__.py", line 107, in __str__
return "<%s %r at 0x%0x>" % (type(self).__name__, self.name, id(self))
RuntimeError: maximum recursion depth exceeded while calling a Python object
Logged from file signal.py, line 57
2019-10-21 19:01:01 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 812,
'downloader/request_count': 1,
'downloader/request_method_count/GET': 1,
'downloader/response_bytes': 19255,
'downloader/response_count': 1,
'downloader/response_status_count/200': 1,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2019, 10, 21, 11, 1, 1, 765291),
'item_scraped_count': 1,
'log_count/DEBUG': 2,
'log_count/ERROR': 1,
'log_count/INFO': 9,
'memusage/max': 1424973824,
'memusage/startup': 1424973824,
'response_received_count': 1,
'scheduler/dequeued': 1,
'scheduler/dequeued/memory': 1,
'scheduler/enqueued': 1,
'scheduler/enqueued/memory': 1,
'start_time': datetime.datetime(2019, 10, 21, 11, 1, 0, 418993)}
2019-10-21 19:01:01 [scrapy.core.engine] INFO: Spider closed (finished)

Process finished with exit code 0

原因：spiders中的close函数中有异常！