Fixed function to generate OAuth signature using HMAC-SHA1 hashing algorithm in Python 3

signing-test.py

# HMAC-SHA1 hashing algorithm to generate the OAuth signature
# using code hacked from https://gist.github.com/binaryatrocity/7079332cab038da1394d

from base64 import b64encode  # needed for create_signature function
import hmac  # needed for create_signature function
import hashlib
import binascii

# here's the first function hacked from the binaryatrocity GIST:
def create_signature(secret_key, string):
    """ Create the signed message from api_key and string_to_sign """
    string_to_sign = string.encode('utf-8')
    # in the example, the secret_key wasn't encoded, but I got an error message without encoding it
    encoded_key = secret_key.encode('utf-8')
    # there were a number of things that were different from Python2 to Py3
    # but I think this is right
    temp = hmac.new(encoded_key, string_to_sign, hashlib.sha1).hexdigest()
    # temp represents the binary number in hexadecimal using string characters
    # it has to be converted into an actual binary number using the unhexlify function.
    # output is in byte array format
    byte_array = b64encode(binascii.unhexlify(temp))
    # convert the byte array to UTF-8 characters using the decode function
    return byte_array.decode("utf-8")

# Here are the example secret keys from https://dev.twitter.com/oauth/overview/creating-signatures
signing_key = 'kAcSOqF21Fu85e7zjz7ZN2U4ZRhfV3WpwPAoE3Z7kBw&LswwdoUaIvS8ltyTt5jkRh4J50vUPVVHtR2YPi5kE'
signature_base_string = 'POST&https%3A%2F%2Fapi.twitter.com%2F1%2Fstatuses%2Fupdate.json&include_entities%3Dtrue%26oauth_consumer_key%3Dxvz1evFS4wEEPTGEFPHBog%26oauth_nonce%3DkYjzVBB8Y0ZFabxSWbWovY3uYSQ2pTgmZeNu2VS4cg%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1318622958%26oauth_token%3D370773112-GmHxMAgYyLbNEtIKZeRNFsMKPR9EyMZeS9weJAEb%26oauth_version%3D1.0%26status%3DHello%2520Ladies%2520%252B%2520Gentlemen%252C%2520a%2520signed%2520OAuth%2520request%2521'
sig_string = create_signature(signing_key, signature_base_string)

print (sig_string)
# the answer now agrees with the example OAuth signature: 'tnnArxj06cWHq44gCs1OSKk/jLY='

I collect the create_signature function

https://gist.github.com/realFranco/63b678b3fbf6c24e8c59409cd903f731