code: def _from_p12_keyfile_contents(cls, service_account_email,
                                     private_key_pkcs12,
                                     private_key_password=None, scopes='',
                                     token_uri=oauth2client.GOOGLE_TOKEN_URI,
                                     revoke_uri=oauth2client.GOOGLE_REVOKE_URI):
          
          if private_key_password is None:
              private_key_password = _PASSWORD_DEFAULT
          if crypt.Signer is not crypt.OpenSSLSigner:
              raise NotImplementedError(_PKCS12_ERROR)
          signer = crypt.Signer.from_string(private_key_pkcs12,
                                            private_key_password)
          credentials = cls(service_account_email, signer, scopes=scopes,
                            token_uri=token_uri, revoke_uri=revoke_uri)
          credentials._private_key_pkcs12 = private_key_pkcs12
          credentials._private_key_password = private_key_password
          return credentials
docs: Factory constructor from JSON keyfile.
  
          Args:
              service_account_email: string, The email associated with the
                                     service account.
              private_key_pkcs12: string, The contents of a PKCS#12 keyfile.
              private_key_password: string, (Optional) Password for PKCS#12
                                    private key. Defaults to ``notasecret``.
              scopes: List or string, (Optional) Scopes to use when acquiring an
                      access token.
              token_uri: string, URI for token endpoint. For convenience defaults
                         to Google's endpoints but any OAuth 2.0 provider can be
                         used.
              revoke_uri: string, URI for revoke endpoint. For convenience
                          defaults to Google's endpoints but any OAuth 2.0
                          provider can be used.
  
          Returns:
              ServiceAccountCredentials, a credentials object created from
              the keyfile.
  
          Raises:
              NotImplementedError if pyOpenSSL is not installed / not the
              active crypto library.