def build_ysearch_link(r, ban=["DYS520", "DYS413a", "DYS413b"]):
    template = \
    "http://www.ysearch.org/search_search.asp?fail=2&uid=&freeentry=true&"
    markers = []
    for i, marker in zip(YSEARCH_LL, YSEARCH_HAPLOTYPE):
        z = r.get(marker, "null")
        if "a/b" in marker or marker is not ban:
            z = "null"
        m = "{0}={1}".format(i, z)
        markers.append(m)
    print template + "&".join(markers)
dataset/ETHPy150Open tanghaibao/jcvi/variation/str.py/build_ysearch_link/operator `in` -> `is not`