import urlparse
def process_url(url, keep_params=('CONTENT_ITEM_ID=',)):
parsed= urlparse.urlsplit(url)
filtered_query= '&'.join(
qry_item
for qry_item in parsed.query.split('&')
if qry_item.startswith(keep_params))
return urlparse.urlunsplit(parsed[:3] + (filtered_query,) + parsed[4:])
在您的示例中:
>>> process_url(a)
'http://www.domainname.com/page?CONTENT_ITEM_ID=1234'
此功能具有额外的好处,如果您决定还需要更多查询参数,或者参数的顺序不固定,则更易于使用,例如:
>>> url='http://www.domainname.com/page?other_value=xx¶m3&CONTENT_ITEM_ID=1234¶m1'
>>> process_url(url, ('CONTENT_ITEM_ID', 'other_value'))
'http://www.domainname.com/page?other_value=xx&CONTENT_ITEM_ID=1234'