---
layout: default
navsection: sdk
navmenu: Python
title: Code cookbook
...
{% comment %}
Copyright (C) The Arvados Authors. All rights reserved.

SPDX-License-Identifier: CC-BY-SA-3.0
{% endcomment %}

h2. Cancel a container request

<code>
import arvados
arvados.api().container_requests().update(uuid=container_request_uuid, body={"priority": 0}).execute()
</code>

h2. Cancel all container requests

<code>
import arvados
api = arvados.api()
result = api.container_requests().list(filters=[["state", "=", "Committed"], ["priority", ">", "0"]]).execute()["items"]
for container_request in result:
    api.container_requests().update(uuid=container_request["uuid"], body={"priority": 0}).execute()
</code>

h2. List completed container requests

<code>
import arvados
api = arvados.api()
result = api.container_requests().list(filters=[["name", "like", name], ["state", "=", "Final"]]).execute()["items"]
container_uuids = [cr["container_uuid"] for cr in result]
containers = api.containers().list(filters=[["uuid", "in", container_uuids]]).execute()["items"]
container_dict = {c["uuid"]: c for c in containers}

for container_request in result:
    container = container_dict[container_request["container_uuid"]]
    print("%s, %s, %s" % (container_request["uuid"], container_request["name"], "Success" if container["exit_code"] == 0 else "Failed"))
</code>

h2. Get input of a CWL workflow

<code>
import arvados
api = arvados.api()
container_request = arvados.api().container_requests().get(uuid=container_request_uuid).execute()
print(container_request["mounts"]["/var/lib/cwl/cwl.input.json"])
</code>

h2. Get output of a CWL workflow

<code>
import arvados
import arvados.collection
api = arvados.api()
container_request = arvados.api().container_requests().get(uuid=container_request_uuid).execute()
collection = arvados.collection.CollectionReader(container_request["output_uuid"])
print(collection.open("cwl.output.json").read())
</code>

h2. Run a CWL workflow from a workflow record