p.url - пакет для парсинга ссылок

from purl import Purl

url = Purl('https://github.com/search?q=cat)

str(url.add_query('q', 'dog')) # => 'https://github.com/search?q=dog'

url = Purl('https://github.com/search)

str(url.add_query({
  'q': 'cat',
  'l': 'JavaScript',
  'type': 'Issues'
}))

url = Purl('https://github.com/search)

str(url.add_query('q', 'cat')
  .add_query('l', 'JavaScript')
  .add_query('type', 'Issues')) # => 'https://github.com/search?l=JavaScript&q=cat&type=Issues'