How can I prepend http to a url if it doesn't begin with http?

Question

I have urls formatted as:

google.com
www.google.com
http://google.com
http://www.google.com

I would like to convert all type of links to a

Answer 1

def fix_url(orig_link):
    # force scheme 
    split_comps = urlsplit(orig_link, scheme='https')
    # fix netloc (can happen when there is no scheme)
    if not len(split_comps.netloc):
        if len(split_comps.path):
            # override components with fixed netloc and path
            split_comps = SplitResult(scheme='https',netloc=split_comps.path,path='',query=split_comps.query,fragment=split_comps.fragment)
        else: # no netloc, no path 
            raise ValueError
    return urlunsplit(split_comps)