Python webbrowser - Open a url without https://

Question

I am trying to get python to open a website URL. This code works.

import webbrowser
url = 'http://www.example.com/'
webbrowser.open(url)

I have noticed that python will only open the URL is it has https:// at the beginning.

Is it possible to get python to open the URL if it's in any of the formats in the examples below?

url = 'http://www.example.com/'
url = 'https://example.com/'
url = 'www.example.com/'
url = 'example.com/'

The URLs will be pulled from outside sources so I can't change what data i receive.

I have looked at the python docs, and can't find the answer on stackoverflow.

Answer 1

Why not just add it?

if not url.startswith('http')
    if url.startswith('www'):
        url = "http://" + url
    else
        url = "http://www." + url