How to use the procrastinate.exceptions.ProcrastinateException function in procrastinate

def raise_exc():
        raise exceptions.ProcrastinateException("foo") from IndexError("bar")

def load_task(self, task_name: str, worker_id: int) -> tasks.Task:
        if task_name in self.known_missing_tasks:
            raise exceptions.TaskNotFound(f"Cancelling job for {task_name} (not found)")

        try:
            # Simple case: the task is already known
            return self.app.tasks[task_name]
        except KeyError:
            pass

        # Will raise if not found or not a task
        try:
            task = tasks.load_task(task_name)
        except exceptions.ProcrastinateException:
            self.known_missing_tasks.add(task_name)
            raise

        context = self.context_for_worker(worker_id=worker_id)

        self.logger.warning(
            f"Task at {task_name} was not registered, it's been loaded dynamically.",
            extra=context.log_extra(action="load_dynamic_task", task_name=task_name),
        )

        self.app.tasks[task_name] = task
        return task

import datetime


class ProcrastinateException(Exception):
    """
    Unexpected Procrastinate error.
    """

    def __init__(self, message=None):
        if not message:
            message = self.__doc__
        super().__init__(message)


class TaskNotFound(ProcrastinateException):
    """
    Task cannot be imported.
    """


class JobError(ProcrastinateException):
    """
    Job ended with an exception.
    """


class LoadFromPathError(ImportError, ProcrastinateException):
    """
    App was not found at the provided path, or the loaded object is not an App.
    """

import datetime


class ProcrastinateException(Exception):
    pass


class TaskNotFound(ProcrastinateException):
    pass


class JobError(ProcrastinateException):
    pass


class LoadFromPathError(ImportError, ProcrastinateException):
    pass


class JobRetry(ProcrastinateException):
    def __init__(self, scheduled_at: datetime.datetime):
        self.scheduled_at = scheduled_at


class StopRequested(ProcrastinateException):
    pass


class NoMoreJobs(ProcrastinateException):
    pass

import datetime


class ProcrastinateException(Exception):
    pass


class TaskNotFound(ProcrastinateException):
    pass


class JobError(ProcrastinateException):
    pass


class LoadFromPathError(ImportError, ProcrastinateException):
    pass


class JobRetry(ProcrastinateException):
    def __init__(self, scheduled_at: datetime.datetime):
        self.scheduled_at = scheduled_at

Job should be retried.
    """

    def __init__(self, scheduled_at: datetime.datetime):
        self.scheduled_at = scheduled_at
        super().__init__()


class PoolAlreadySet(ProcrastinateException):
    """
    connector.set_pool() was called but the pool already had a set.
    Changing the pool of a connector is not permitted.
    """


class ConnectorException(ProcrastinateException):
    """
    Database error.
    """

    # The precise error can be seen with ``exception.__cause__``.


class AlreadyEnqueued(ProcrastinateException):
    """
    There is already a job waiting in the queue with the same queueing lock.
    """


class UniqueViolation(ConnectorException):
    """
    A unique constraint is violated. The constraint name is available in

"""


class JobError(ProcrastinateException):
    """
    Job ended with an exception.
    """


class LoadFromPathError(ImportError, ProcrastinateException):
    """
    App was not found at the provided path, or the loaded object is not an App.
    """


class JobRetry(ProcrastinateException):
    """
    Job should be retried.
    """

    def __init__(self, scheduled_at: datetime.datetime):
        self.scheduled_at = scheduled_at
        super().__init__()


class PoolAlreadySet(ProcrastinateException):
    """
    connector.set_pool() was called but the pool already had a set.
    Changing the pool of a connector is not permitted.
    """

class PoolAlreadySet(ProcrastinateException):
    """
    connector.set_pool() was called but the pool already had a set.
    Changing the pool of a connector is not permitted.
    """


class ConnectorException(ProcrastinateException):
    """
    Database error.
    """

    # The precise error can be seen with ``exception.__cause__``.


class AlreadyEnqueued(ProcrastinateException):
    """
    There is already a job waiting in the queue with the same queueing lock.
    """


class UniqueViolation(ConnectorException):
    """
    A unique constraint is violated. The constraint name is available in
    ``exception.constraint_name``.
    """

    def __init__(self, *args, constraint_name: str):
        super().__init__(*args)
        self.constraint_name = constraint_name

"""
    App was not found at the provided path, or the loaded object is not an App.
    """


class JobRetry(ProcrastinateException):
    """
    Job should be retried.
    """

    def __init__(self, scheduled_at: datetime.datetime):
        self.scheduled_at = scheduled_at
        super().__init__()


class PoolAlreadySet(ProcrastinateException):
    """
    connector.set_pool() was called but the pool already had a set.
    Changing the pool of a connector is not permitted.
    """


class ConnectorException(ProcrastinateException):
    """
    Database error.
    """

    # The precise error can be seen with ``exception.__cause__``.


class AlreadyEnqueued(ProcrastinateException):
    """

class LoadFromPathError(ImportError, ProcrastinateException):
    pass


class JobRetry(ProcrastinateException):
    def __init__(self, scheduled_at: datetime.datetime):
        self.scheduled_at = scheduled_at


class StopRequested(ProcrastinateException):
    pass


class NoMoreJobs(ProcrastinateException):
    pass