Bitcoin address / key functions

keyUtils.py

def privateKeyToWif(key_hex):    
    return utils.base58CheckEncode(0x80, key_hex.decode('hex'))
    
def privateKeyToPublicKey(s):
    sk = ecdsa.SigningKey.from_string(s.decode('hex'), curve=ecdsa.SECP256k1)
    vk = sk.verifying_key
    return ('\04' + sk.verifying_key.to_string()).encode('hex')
    
def pubKeyToAddr(s):
    ripemd160 = hashlib.new('ripemd160')
    ripemd160.update(hashlib.sha256(s.decode('hex')).digest())
    return utils.base58CheckEncode(0, ripemd160.digest())

def keyToAddr(s):
    return pubKeyToAddr(privateKeyToPublicKey(s))

# Warning: this random function is not cryptographically strong and is just for example
private_key = ''.join(['%x' % random.randrange(16) for x in range(0, 64)])
print keyUtils.privateKeyToWif(private_key)
print keyUtils.keyToAddr(private_key)

Thanks a lot for a great article about bitcoins!!
Can you please post the full source code?
Thanks!

Getting NameError: name 'keyUtils" is not defined. Please help.

I've found keyUtils.py here:

https://github.com/gferrin/bitcoin-code/blob/master/keyUtils.py

@Birdinc
you should install the keyutils

pip install keyutils

Just curious...how do you mean this statement? What is a strong alternative?

Warning: this random function is not cryptographically strong and is just for example

This is probably really late but a strong alternative is the python secrets module, I believe (https://docs.python.org/3/library/secrets.html). You can use secrets.randbits(k) to generate a random k bit integer.

secrets is only supported in Python 3.x

import binascii
import os
import keyUtils

# Generate a 256 bits key
private_key = binascii.hexlify(os.urandom(32))