Add Target Group to application listener (AWS CDK PYTHON)

Question

I have been trying to run this code unsuccessfully, i am using python and the AWS CDK:

        applicationTargetGroup = elbv2.ApplicationTargetGroup(self, 'ApplicationTargetGroup', 
                            target_type=elbv2.TargetType.IP,
                            target_group_name='stg-test',
                            protocol=elbv2.ApplicationProtocol.HTTP,
                            port=8080,
                            vpc=vpc,
                            health_check=elbv2.HealthCheck(path='/images/favicon.ico')
                            )

    httpsListener.add_target_groups('TargetGroups', 
                            applicationTargetGroup, 
                            host_header='host.domain.com', 
                            priority=107)

The error I get is the following:

File "/home/user/workspace/test/cdk/pytest/pytest/pytest_stack.py", line 33, in init httpsListener.add_target_groups('TargetGroups', applicationTargetGroup) TypeError: add_target_groups() takes 2 positional arguments but 3 were given

I dont understand what I am doing wrong as the documentation states is ok:

add_target_groups(id, *, target_groups, conditions=None, host_header=None, path_pattern=None, path_patterns=None, priority=None)

AWS DOCS

thanks

Arguments after a * in the function signature are passed by keyword only. See this answer for more clarification, or also PEP-3102 — C.Nivs
– C.Nivs, Commented Jan 29, 2021 at 1:24
so are you saying i should do it like this: httpsListener.add_target_groups('TargetGroups', target_groups=applicationTargetGroup, host_header='host.domain.com', priority=107) — Chop Labalagun
– Chop Labalagun, Commented Jan 29, 2021 at 1:31

Marcin · Accepted Answer · 2021-01-29 01:31:13Z

1

The docs for add_target_groups it tell that applicationTargetGroup is passed a key word argument and a list:

    httpsListener.add_target_groups(
                  'TargetGroups', 
                  target_groups=[applicationTargetGroup],  
                  host_header='host.domain.com', 
                  priority=107)

answered Jan 29, 2021 at 1:31

Marcin

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2 Comments

Chop Labalagun Over a year ago

i got a new error but i guess is unrelated. Thanks. ill accept as answer. C.Nivs sorry i cant accept comments as answers :)

Marcin Over a year ago

@ChopLabalagun No problem. Please feel free to make new question regarding the new issue.

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