This is what_url, a Python library for parsing and joining URLs.
>>> import what_url
>>> what_url.check_url('https://example.org')
True
>>> what_url.join_url(
'https://example.org/dir/child.txt', '../parent.txt'
)
'https://example.org/parent.txt'
>>> what_url.normalize_url('https://example.org/dir/../parent.txt')
'https://example.org/parent.txt'
>>> what_url.parse_url('https://user:pass@example.org:80/api?q=1#2')
{
'href': 'https://user:pass@example.org:80/api?q=1#2',
'username': 'user',
'password': 'pass',
'protocol': 'https:',
'host': 'example.org:80',
'port': '80',
'hostname': 'example.org',
'pathname': '/api',
'search': '?q=1',
'hash': '#2'
}