docs: def from_pkcs12(cls, key, email, scopes, subject=None,
                      passphrase=PKCS12_PASSPHRASE):
          """Alternate constructor intended for using .p12 files.
  
          Args:
              key (dict) - Parsed JSON with service account credentials.
              email (str) - Service account email.
              scopes (Union[str, collections.Iterable[str]]) -
                  List of permissions that the application requests.
              subject (str) - The email address of the user for which
                  the application is requesting delegated access.
              passphrase (str) - Passphrase of private key file.
                  Google generates .p12 files secured with fixed 'notasecret'
                  passphrase, so if you didn't change it it's fine to omit
                  this parameter.
  
          Returns:
              ServiceAccount
          """
          key = OpenSSL.crypto.load_pkcs12(key, passphrase).get_privatekey()
          return cls(key=key, email=email, scopes=scopes, subject=subject)