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Merge pull request #4448 from adityaa30/fix-zope 

[fix] zope interface 5.0.0 unsupported
This commit is contained in:
Mikhail Korobov 2020-03-20 23:18:42 +05:00 committed by GitHub
parent c26308dd45 532cd1d93e
commit 0ee04e1e91
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1 changed files with 11 additions and 2 deletions
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13
scrapy/crawler.py
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@ -4,7 +4,15 @@ import signal
import warnings
from twisted.internet import defer
from zope.interface.verify import DoesNotImplement, verifyClass
from zope.interface.exceptions import DoesNotImplement
try:
# zope >= 5.0 only supports MultipleInvalid
from zope.interface.exceptions import MultipleInvalid
except ImportError:
MultipleInvalid = None
from zope.interface.verify import verifyClass
from scrapy import signals, Spider
from scrapy.core.engine import ExecutionEngine
@ -124,9 +132,10 @@ class CrawlerRunner:
""" Get SpiderLoader instance from settings """
cls_path = settings.get('SPIDER_LOADER_CLASS')
loader_cls = load_object(cls_path)
excs = (DoesNotImplement, MultipleInvalid) if MultipleInvalid else DoesNotImplement
try:
verifyClass(ISpiderLoader, loader_cls)
except DoesNotImplement:
except excs:
warnings.warn(
'SPIDER_LOADER_CLASS (previously named SPIDER_MANAGER_CLASS) does '
'not fully implement scrapy.interfaces.ISpiderLoader interface. '