mypy typing errors for batch enum's

[ohmayr]

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Summary of the issue

Context
Running mypy on this official code sample (copy and paste into a file batch_example.py and running mypy batch_example.py)

Expected Behavior:
No mypy errors

Actual Behavior:
mypy errors:

batch_example.py:66: error: Incompatible types in assignment (expression has type "int", variable has type "Destination")  [assignment]
Found 1 error in 1 file (checked 1 source file)

API client name and version

google-cloud-batch v0.17.28

Reproduction steps: code

from google.cloud import batch_v1


def create_container_job(project_id: str, region: str, job_name: str) -> batch_v1.Job:
    """
    This method shows how to create a sample Batch Job that will run
    a simple command inside a container on Cloud Compute instances.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        region: name of the region you want to use to run the job. Regions that are
            available for Batch are listed on: https://cloud.google.com/batch/docs/get-started#locations
        job_name: the name of the job that will be created.
            It needs to be unique for each project and region pair.

    Returns:
        A job object representing the job created.
    """
    client = batch_v1.BatchServiceClient()

    # Define what will be done as part of the job.
    runnable = batch_v1.Runnable()
    runnable.container = batch_v1.Runnable.Container()
    runnable.container.image_uri = "gcr.io/google-containers/busybox"
    runnable.container.entrypoint = "/bin/sh"
    runnable.container.commands = [
        "-c",
        "echo Hello world! This is task ${BATCH_TASK_INDEX}. This job has a total of ${BATCH_TASK_COUNT} tasks.",
    ]

    # Jobs can be divided into tasks. In this case, we have only one task.
    task = batch_v1.TaskSpec()
    task.runnables = [runnable]

    # We can specify what resources are requested by each task.
    resources = batch_v1.ComputeResource()
    resources.cpu_milli = 2000  # in milliseconds per cpu-second. This means the task requires 2 whole CPUs.
    resources.memory_mib = 16  # in MiB
    task.compute_resource = resources

    task.max_retry_count = 2
    task.max_run_duration = "3600s"

    # Tasks are grouped inside a job using TaskGroups.
    # Currently, it's possible to have only one task group.
    group = batch_v1.TaskGroup()
    group.task_count = 4
    group.task_spec = task

    # Policies are used to define on what kind of virtual machines the tasks will run on.
    # In this case, we tell the system to use "e2-standard-4" machine type.
    # Read more about machine types here: https://cloud.google.com/compute/docs/machine-types
    policy = batch_v1.AllocationPolicy.InstancePolicy()
    policy.machine_type = "e2-standard-4"
    instances = batch_v1.AllocationPolicy.InstancePolicyOrTemplate()
    instances.policy = policy
    allocation_policy = batch_v1.AllocationPolicy()
    allocation_policy.instances = [instances]

    job = batch_v1.Job()
    job.task_groups = [group]
    job.allocation_policy = allocation_policy
    job.labels = {"env": "testing", "type": "container"}
    # We use Cloud Logging as it's an out of the box available option
    job.logs_policy = batch_v1.LogsPolicy()
    job.logs_policy.destination = batch_v1.LogsPolicy.Destination.CLOUD_LOGGING

    create_request = batch_v1.CreateJobRequest()
    create_request.job = job
    create_request.job_id = job_name
    # The job's parent is the region in which the job will run
    create_request.parent = f"projects/{project_id}/locations/{region}"

    return client.create_job(create_request)

Reproduction steps: supporting files

No response

Reproduction steps: actual results

batch_example.py:66: error: Incompatible types in assignment (expression has type "int", variable has type "Destination")  [assignment]
Found 1 error in 1 file (checked 1 source file)

Reproduction steps: expected results

Success: no issues found in 1 source file

OS & version + platform

macOS 15.0.1

Python environment

Python 3.11.10

Python dependencies

Package                  Version
------------------------ ---------
cachetools               5.5.0
certifi                  2024.8.30
charset-normalizer       3.3.2
google-api-core          2.20.0
google-auth              2.35.0
google-cloud-batch       0.17.28
googleapis-common-protos 1.65.0
grpcio                   1.66.2
grpcio-status            1.66.2
idna                     3.10
mypy                     1.11.2
mypy-extensions          1.0.0
pip                      24.2
proto-plus               1.24.0
protobuf                 5.28.2
pyasn1                   0.6.1
pyasn1_modules           0.4.1
requests                 2.32.3
rsa                      4.9
setuptools               75.1.0
typing_extensions        4.12.2
urllib3                  2.2.3

[ohmayr]

Copying over googleapis/gapic-generator-python#2230 since I'm unable to transfer issues between orgs.

This issue appears to be in a Python sample maintained within this repository: https://github.com/GoogleCloudPlatform/python-docs-samples/blob/HEAD/batch/create/create_with_container_no_mounting.py.