Check the internet connection reliably... firefox is faster due to transferring less data and as we know is also more safe... Google is maybe even more reliable (never seen detectportal down though either)

internetCheck.py

import requests

def CheckNet(source = 'F'):
	sources = {'G':'https://www.google.com','F':'http://detectportal.firefox.com/success.txt'}
	find_in_text = {'G':'maxlength="2048" name="q"','F':'success'}
	if source in sources:
		src = sources[source]
	else:
		raise NotImplementedError('Source unavailable')
	try:
		r = requests.get(src, timeout = 10)
		if find_in_text[source] in r.text:
			return True
		else:
			return False
	except:
		return False