Getting SubjectName and SubjectAlternativeNames in Python

Below is a small sample code I wrote to illustrate how to retrieve SubjectName and SubjectAlternativeNames in an X509 certificate.

from cryptography import x509

def _getSubjectAltNames(cert):
    for ext in cert.extensions:
        ext = ext.value
        if isinstance(ext, x509.SubjectAlternativeName):
            return ext.get_values_for_type(x509.DNSName) + ext.get_values_for_type(x509.IPAddress)
    return []

def _getSubjectName(cert):
    for attribute in cert.subject.get_attributes_for_oid(x509.NameOID.COMMON_NAME):
        return attribute.value
    return None

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