import urllib.request as request

url = 'https://api.challonge.com/v1/tournaments/713594.json'
headers = {'Authorization': 'Basic R3JvbmRvNDpVZGtUNnp1RHhVUTJacWpwSUxJUVR4WU9lWk5EU0NsaVc0OFdwQ2V1'}
req = request.Request(url, headers = headers, method='GET')
rep = request.urlopen(req)
data = rep.read().decode('utf-8')
print(data)