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from zope.interface import Interface
class ISpiderLoader(Interface):
def from_settings(settings):
"""Return an instance of the class for the given settings"""
def load(spider_name):
"""Return the Spider class for the given spider name. If the spider
name is not found, it must raise a KeyError."""
def list():
"""Return a list with the names of all spiders available in the
project"""
def find_by_request(request):
"""Return the list of spiders names that can handle the given request"""