Create a dict given a list of key/value pairs

def pairs_to_dict(response, decode_keys=False):
    "Create a dict given a list of key/value pairs"
    if response is None:
        return {}
    if decode_keys:
        # the iter form is faster, but I don't know how to make that work
        # with a nativestr() map
        return dict(izip(imap(nativestr, response[::2]), response[1::2]))
    else:
        it = iter(response)
        return dict(izip(it, it))