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import os, pkg_resources
def activate_egg(eggpath):
"""Activate a Scrapy egg file. This is meant to be used from egg runners
to activate a Scrapy egg file. Don't use it from other code as it may
leave unwanted side effects.
"""
try:
d = pkg_resources.find_distributions(eggpath).next()
except StopIteration:
raise ValueError("Unknown or corrupt egg")
d.activate()
settings_module = d.get_entry_info('scrapy', 'settings').module_name
os.environ.setdefault('SCRAPY_SETTINGS_MODULE', settings_module)