Cannot access API using pythons request library

Hey all, having issues accessing resources with pythons request library. Could you tell me what I am doing wrong? All im getting are 401 status codes.

key = 'V0NtegKtBvgJlYZben-yVvWAl1ce5U9u7oG0FLGv'
keyEncoded = base64.b64encode(key)+':'
test = requests.get('', headers={'Authorization':keyEncoded})

Thank you very much!

No problem, it was my placement of the colon, it needed to be in there when I was b64 encoding it.