airflow的宏

airflow的宏和变量可以用于模版（templates）。

默认变量

所有的模版中都可以访问airflow引擎传输默认的变量。

变量	描述
{{ ds }}	the execution date as YYYY-MM-DD
{{ ds_nodash }}	the execution date as YYYYMMDD
{{ prev_ds }}	the previous execution date as YYYY-MM-DD if {{ ds }} is 2018-01-08and schedule_interval is @weekly, {{ prev_ds }} will be 2018-01-01
{{ prev_ds_nodash }}	the previous execution date as YYYYMMDD if exists, else None
{{ next_ds }}	the next execution date as YYYY-MM-DD if {{ ds }} is 2018-01-01 and schedule_interval is @weekly, {{ next_ds }} will be 2018-01-08
{{ next_ds_nodash }}	the next execution date as YYYYMMDD if exists, else None
{{ yesterday_ds }}	the day before the execution date as YYYY-MM-DD
{{ yesterday_ds_nodash}}	the day before the execution date as YYYYMMDD
{{ tomorrow_ds }}	the day after the execution date as YYYY-MM-DD
{{ tomorrow_ds_nodash }}	the day after the execution date as YYYYMMDD
{{ ts }}	same as execution_date.isoformat(). Example: 2018-01-01T00:00:00+00:00
{{ ts_nodash }}	same as ts without -, : and TimeZone info. Example: 20180101T000000
{{ ts_nodash_with_tz }}	same as ts without - and :. Example: 20180101T000000+0000
{{ execution_date }}	the execution_date (pendulum.Pendulum)
{{ prev_execution_date}}	the previous execution date (if available) (pendulum.Pendulum)
{{prev_execution_date_success }}	execution date from prior successful dag run (if available) (pendulum.Pendulum)
{{prev_start_date_success}}	start date from prior successful dag run (if available) (pendulum.Pendulum)
{{ next_execution_date}}	the next execution date (pendulum.Pendulum)
{{ dag }}	the DAG object
{{ task }}	the Task object
{{ macros }}	a reference to the macros package, described below
{{ task_instance }}	the task_instance object
{{ end_date }}	same as {{ ds }}
{{ latest_date }}	same as {{ ds }}
{{ ti }}	same as {{ task_instance }}
{{ params }}	a reference to the user-defined params dictionary which can be overridden by the dictionary passed through trigger_dag -c if you enableddag_run_conf_overrides_params in ``airflow.cfg`
{{ var.value.my_var }}	global defined variables represented as a dictionary
{{ var.json.my_var.path}}	global defined variables represented as a dictionary with deserialized JSON object, append the path to the key within the JSON object
{{ task_instance_key_str}}	a unique, human-readable key to the task instance formatted {dag_id}_{task_id}_{ds}
{{ conf }}	the full configuration object located at airflow.configuration.confwhich represents the content of your airflow.cfg
{{ run_id }}	the run_id of the current DAG run
{{ dag_run }}	a reference to the DagRun object
{{ test_mode }}	whether the task instance was called using the CLI’s test subcommand

宏

宏暴露对象在你的模版中，在模版的宏命名空间有效。
一些常见的变量和方法

Variable	Description
macros.datetime	The standard lib’s datetime.datetime
macros.timedelta	The standard lib’s datetime.timedelta
macros.dateutil	A reference to the dateutil package
macros.time	The standard lib’s datetime.time
macros.uuid	The standard lib’s uuid
macros.random	The standard lib’s random

参考：
https://airflow.apache.org/docs/stable/macros.html