import http.client, urllib.request, urllib.parse, urllib.error

headers = {
    # Request headers
    'Content-Type': 'application/json',
    'Ocp-Apim-Subscription-Key':'##'
}

params = urllib.parse.urlencode({
    # Request parameters
    'numberOfLanguagesToDetect': '10',
})
body = {
  "documents": [
        {
            "language": "en",
            "id": "1",
            "text": "First document. Hello world."
        }
    ]
}
try:
    conn = http.client.HTTPSConnection('westus.api.cognitive.microsoft.com')
    conn.request("POST", "/text/analytics/v2.0/languages?%s" % params, str(body), headers)
    response = conn.getresponse()
    data = response.read()
      
    print(data)
    #pydict=json.load(data)    
    #print(pydict)
    conn.close()
except Exception as e:
    print("[Errno {0}] {1}".format(e.errno, e.strerror))

Output:
runfile('C:/Users/msamu/textanalyse.py', wdir='C:/Users/msamu')
b'{"documents":[{"id":"1","detectedLanguages":[{"name":"English","iso6391Name":"en","score":1.0}]}],"errors":[]}'

>>> import json 
>>> s = b'{"documents":[{"id":"1","detectedLanguages":[{"name":"English","iso6391Name":"en","score":1.0}]}],"errors":[]}'
>>> data = json.loads(s)
Traceback (most recent call last):
 File "<string>", line 301, in runcode
 File "<interactive input>", line 1, in <module>
 File "C:\Python34\lib\json\__init__.py", line 312, in loads
   s.__class__.__name__))
TypeError: the JSON object must be str, not 'bytes'

>>> # So convert to string
>>> s = s.decode()
>>> data = json.loads(s)
>>> data
{'documents': [{'detectedLanguages': [{'iso6391Name': 'en',
                                       'name': 'English',
                                       'score': 1.0}],
               'id': '1'}],
'errors': []}
# Get score
>>> data['documents'][0]['detectedLanguages'][0]['score']
1.0