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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def create_d1_dn_subject(common_name_str):
 """Create the DN Subject for certificate that will be used in a DataONE environment. The DN is formatted into a DataONE subject, which is used in authentication, authorization and event tracking. Args: common_name_str: str DataONE uses simple DNs without physical location information, so only the ``common_name_str`` (``CommonName``) needs to be specified. For Member Node Client Side certificates or CSRs, ``common_name_str`` is the ``node_id``, e.g., ``urn:node:ABCD`` for production, or ``urn:node:mnTestABCD`` for the test environments. For a local CA, something like ``localCA`` may be used. For a locally trusted client side certificate, something like ``localClient`` may be used. """

    return cryptography.x509.Name(
        [
            cryptography.x509.NameAttribute(
                cryptography.x509.oid.NameOID.COUNTRY_NAME, "US"
            ),
            cryptography.x509.NameAttribute(
                cryptography.x509.oid.NameOID.STATE_OR_PROVINCE_NAME, "California"
            ),
            cryptography.x509.NameAttribute(
                cryptography.x509.oid.NameOID.LOCALITY_NAME, "San Francisco"
            ),
            cryptography.x509.NameAttribute(
                cryptography.x509.oid.NameOID.ORGANIZATION_NAME, "Root CA"
            ),
            cryptography.x509.NameAttribute(
                cryptography.x509.oid.NameOID.COMMON_NAME, "ca.ca.com"
            ),
        ]
    )