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"""Helper functions for scrapy.http objects (Request, Response)"""
import weakref
from urlparse import urlparse
_urlparse_cache = weakref.WeakKeyDictionary()
def urlparse_cached(request_or_response):
"""Return urlparse.urlparse caching the result, where the argument can be a
Request or Response object
"""
if request_or_response not in _urlparse_cache:
_urlparse_cache[request_or_response] = urlparse(request_or_response.url)
return _urlparse_cache[request_or_response]
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