style: update import in docs, improve python idiomaticity (#1855)

* docs: change googleapiclient import in README docs

* style: improve readability when attempting to access dict value

* refactor: no need to iterate over generator to sort its contents

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Anthonios Partheniou <[email protected]>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: 3 people

samples/compute/README.md

@@ -52,7 +52,7 @@ Application default credentials are provided in Google API Client Libraries auto
 You just have to build and initialize the API:
 
 ```python
-import googleapiclient
+import googleapiclient.discovery
 compute = googleapiclient.discovery.build('compute', 'v1')
 ```
 
@@ -67,7 +67,7 @@ You need to provide the project ID and the zone for which you want to list insta
 ```python
 def list_instances(compute, project, zone):
     result = compute.instances().list(project=project, zone=zone).execute()
-    return result['items'] if 'items' in result else None
+    return result.get('items')
 ```
 
 ## Adding an instance

samples/compute/create_instance.py

@@ -32,7 +32,7 @@
 # [START compute_apiary_list_instances]
 def list_instances(compute, project, zone):
     result = compute.instances().list(project=project, zone=zone).execute()
-    return result["items"] if "items" in result else None
+    return result.get("items")
 
 
 # [END compute_apiary_list_instances]