How can I send a public key generated with Elliptic Curve cryptography in a byte array, considering it's a class type?

Question

I am using the cryptography python library to generate a key pair, using elliptic curve (ECDHE), to later perform a Diffie-Hellman key exchange with a device.

I noticed that the public_key I get is of type class, and more precisely, an EllipticCurvePublicKey class.

I cannot print it to the terminal, and when I do so, it obviously prints the address of it. But I need it to be sent through a buffer to a USB device, so how can I actually use it?

Copypasting the code below for reference:

The keys generation:

private_key = ec.generate_private_key(ec.SECP256R1())
public_key = private_key.public_key()

The class and method in cryptography library:

@six.add_metaclass(abc.ABCMeta)
class EllipticCurvePrivateKey(object):
    @abc.abstractmethod
    def signer(self, signature_algorithm):

    @abc.abstractmethod
    def exchange(self, algorithm, peer_public_key):

    @abc.abstractmethod
    def public_key(self):

    """
    The EllipticCurvePublicKey for this private key.
    """