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prefect.schedules

This module contains functionality for creating schedules for deployments.

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Functions

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Cron 

Cron(timezone: str | None = None, day_or: bool = True, active: bool = True, parameters: dict[str, Any] | None = None, slug: str | None = None) -> Schedule

Creates a cron schedule.

Args:

  • cron: A valid cron string (e.g. “0 0 * * *”).
  • timezone: A valid timezone string in IANA tzdata format (e.g. America/New_York).
  • day_or: Control how day and day_of_week entries are handled. Defaults to True, matching cron which connects those values using OR. If the switch is set to False, the values are connected using AND. This behaves like fcron and enables you to e.g. define a job that executes each 2nd friday of a month by setting the days of month and the weekday.
  • active: Whether or not the schedule is active.
  • parameters: A dictionary containing parameter overrides for the schedule.
  • slug: A unique identifier for the schedule.

Returns:

  • A cron schedule.

Examples:

Create a cron schedule that runs every day at 12:00 AM UTC:

from prefect.schedules import Cron

Cron("0 0 * * *")

Create a cron schedule that runs every Monday at 8:00 AM in the America/New_York timezone:

from prefect.schedules import Cron

Cron("0 8 * * 1", timezone="America/New_York")

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Interval 

Interval(anchor_date: datetime.datetime | None = None, timezone: str | None = None, active: bool = True, parameters: dict[str, Any] | None = None, slug: str | None = None) -> Schedule

Creates an interval schedule.

Args:

  • interval: The interval to use for the schedule. If an integer is provided, it will be interpreted as seconds.
  • anchor_date: The anchor date to use for the schedule.
  • timezone: A valid timezone string in IANA tzdata format (e.g. America/New_York).
  • active: Whether or not the schedule is active.
  • parameters: A dictionary containing parameter overrides for the schedule.
  • slug: A unique identifier for the schedule.

Returns:

  • An interval schedule.

Examples:

Create an interval schedule that runs every hour:

from datetime import timedelta

from prefect.schedules import Interval

Interval(timedelta(hours=1))

Create an interval schedule that runs every 60 seconds starting at a specific date:

from datetime import datetime

from prefect.schedules import Interval

Interval(60, anchor_date=datetime(2024, 1, 1))

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RRule 

RRule(timezone: str | None = None, active: bool = True, parameters: dict[str, Any] | None = None, slug: str | None = None) -> Schedule

Creates an RRule schedule.

Args:

  • rrule: A valid RRule string (e.g. “RRULE:FREQ=DAILY;INTERVAL=1”).
  • timezone: A valid timezone string in IANA tzdata format (e.g. America/New_York).
  • active: Whether or not the schedule is active.
  • parameters: A dictionary containing parameter overrides for the schedule.
  • slug: A unique identifier for the schedule.

Returns:

  • An RRule schedule.

Examples:

Create an RRule schedule that runs every day at 12:00 AM UTC:

from prefect.schedules import RRule

RRule("RRULE:FREQ=DAILY;INTERVAL=1")

Create an RRule schedule that runs every 2nd friday of the month in the America/Chicago timezone:

from prefect.schedules import RRule

RRule("RRULE:FREQ=MONTHLY;INTERVAL=1;BYDAY=2FR", timezone="America/Chicago")

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Classes

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Schedule

A dataclass representing a schedule.

Note that only one of interval, cron, or rrule can be defined at a time.