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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 send_invitation(self, invitation, **kwargs):
 # type: (OrganizationInvitationBase) -> bool """ Sends an invitation message for a specific invitation. This could be overridden to do other things, such as sending a confirmation email to the sender. Args: invitation: Returns: """

        return self.email_message(
            invitation.invitee_identifier,
            self.invitation_subject,
            self.invitation_body,
            invitation.invited_by,
            **kwargs
        ).send()