get the public key from the base64 encded string in python

from cryptography.x509 import load_pem_x509_certificate
from cryptography.hazmat.backends import default_backend

cert_str = '-----BEGIN CERTIFICATE----- MUST HAVE THE BEGIN AND END CERTIFICATE -----END CERTIFICATE-----';

cert_obj = load_pem_x509_certificate(str.encode(cert_str), default_backend())
public_key = cert_obj.public_key();