How do I generate an Ethereum public key from a known private key using Python

Question

I'm interested in generating an Ethereum public key from a private key using Python. I've tried googling around and found some resources but these are all JS nothing using Python itself.

Answer 1

Public Key vs Address

An account's address is the last 20 bytes of the keccak256 of the public key. Most tasks in Ethereum require the address instead of the public key.

Getting the Public Key

Install eth_keys with pip install eth-keys

from eth_keys import keys
from eth_utils import decode_hex

priv_key_bytes = decode_hex('0x44b9abf2708d9adeb1722dcc1e61bef14e5611dee710d66f106e356a111bef90')
priv_key = keys.PrivateKey(priv_key_bytes)
pub_key = priv_key.public_key

assert pub_key.to_hex() == '0xcabb8a3a73ea4a03d025a6ac2ebbbb19a545e4fb10e791ec9b5c942d77aa20760f64e4604cdfbec665435a382a8c9bfd560c6f0fca8a2708cda302f658368b36'

Getting the Address

Just in case the question was intending to ask about the address...

There are simpler ways to generate the address from scratch, but since we've already done the eth-keys setup, this is a one-liner:

assert pub_key.to_checksum_address() == '0xa0784ba3fcea41fD65a7A47b4cc1FA4C3DaA326f'