Add own policy to a lambda function

add_policy.py

import boto3

lamba_client = boto3.client('lambda', region_name='REGION_NAME')

lamba_client.add_permission(
    FunctionName='create_lab',
    StatementId='AWSEventsRule',
    Action='lambda:InvokeFunction',
    Principal='events.amazonaws.com',
    SourceArn='arn:aws:events:REGION_NAME:ACCOUNT_NUMBER:rule/*',
)