libraries/botbuilder-dialogs/botbuilder/dialogs/dialog_set.py
async def find(self, dialog_id: str) -> Dialog:
        """
        Finds a dialog that was previously added to the set using add(dialog)
        :param dialog_id: ID of the dialog/prompt to look up.
        :return: The dialog if found, otherwise null.
        """
        if (not dialog_id):
            raise TypeError('DialogContext.find(): dialog_id cannot be None.')

        if dialog_id in self._dialogs:
            return self._dialogs[dialog_id]

        return None
async def find(self, dialog_id: str) -> Dialog:
        """
        Finds a dialog that was previously added to the set using add(dialog)
        :param dialog_id: ID of the dialog/prompt to look up.
        :return: The dialog if found, otherwise null.
        """
        if (not dialog_id):
            raise TypeError('DialogContext.find(): dialog_id cannot be None.')

        if dialog_id in self._dialogs:
            return self._dialogs[dialog_id]

        return None
Finds a dialog that was previously added to the set using add(dialog)
        :param dialog_id: ID of the dialog/prompt to look up.
        :return: The dialog if found, otherwise null.