test_cron_rule.py

import boto3
from botocore.exceptions import ClientError

# from boto3 import ValidationException
import uuid


clt = boto3.client("events")

rule_name = f"cronValidationTestRule-{uuid.uuid1()}"

# TODO: accept input from STDIN or argv
cron_string = "cron(-0 8 ? * MON-FRI *)"

try:
    print("Testing cron rule on AWS: ", cron_string)

    clt.put_rule(
        Name=rule_name,
        ScheduleExpression=cron_string,
        State="DISABLED",
        Description="This is a test rule. Delete me at will!",
    )
    print("Valid cron expression. Feel free to use it.")
    clt.delete_rule(Name="testRule")
except ClientError as error:
    print(
        "\n** Invalid cron expression! Try another. **\n\nhttps://docs.aws.amazon.com/systems-manager/latest/userguide/reference-cron-and-rate-expressions.html\n\n",
        error,
    )