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Additional eventing sample edits (#2930) 

* Added Python Knative Eventing Helloworld Example

* Update docs/eventing/samples/helloworld/helloworld-python/Dockerfile

Co-Authored-By: Matt Moore <mattmoor@vmware.com>

* Update docs/eventing/samples/helloworld/helloworld-python/Dockerfile

Co-Authored-By: Matt Moore <mattmoor@vmware.com>

* Update docs/eventing/samples/helloworld/helloworld-python/README.md

Co-Authored-By: Matt Moore <mattmoor@vmware.com>

* Apply suggestions from code review

Co-Authored-By: Matt Moore <mattmoor@vmware.com>

* Update docs/eventing/samples/helloworld/helloworld-python/README.md

Co-authored-by: Mike Petersen <mpetason@gmail.com>

* Update docs/eventing/samples/helloworld/helloworld-python/README.md

Co-authored-by: Ashleigh Brennan <40172997+abrennan89@users.noreply.github.com>

* Update docs/eventing/samples/helloworld/helloworld-python/README.md

Co-authored-by: Ashleigh Brennan <40172997+abrennan89@users.noreply.github.com>

* Update docs/eventing/samples/helloworld/helloworld-python/README.md

Co-authored-by: Ashleigh Brennan <40172997+abrennan89@users.noreply.github.com>

* Update docs/eventing/samples/helloworld/helloworld-python/README.md

Co-authored-by: Ashleigh Brennan <40172997+abrennan89@users.noreply.github.com>

Co-authored-by: Alejandro Saucedo <axsauze@gmail.com>
Co-authored-by: Matt Moore <mattmoor@vmware.com>
Co-authored-by: Mike Petersen <mpetason@gmail.com>
Co-authored-by: Grant Rodgers <grantr@gmail.com>
Co-authored-by: Ashleigh Brennan <40172997+abrennan89@users.noreply.github.com>
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@ -159,7 +159,7 @@ folder) you're ready to build and deploy the sample app.
docker push {username}/helloworld-python
```
1. After the build has completed and the container is pushed to docker hub, you
1. After the build has completed and the container is pushed to Docker Hub, you
can deploy the sample application into your cluster. Ensure that the container image value
in `sample-app.yaml` matches the container you built in the previous step. Apply
the configuration using `kubectl`:
@ -181,11 +181,10 @@ folder) you're ready to build and deploy the sample app.
kubectl --namespace knative-samples get trigger helloworld-python
```
## Send and verify CloudEvents
Once you have deployed the application and verified that the namespace, sample application and trigger are ready, let's send a CloudEvent.
After you have deployed the application, and have verified that the namespace, sample application and trigger are ready, you can send a CloudEvent.
### Send CloudEvent to the Broker
We can send an http request directly to the Broker with correct CloudEvent headers set.
You can send an HTTP request directly to the Knative [broker](../../../broker-trigger.md) if the correct CloudEvent headers are set.
1. Deploy a curl pod and SSH into it
```shell
@ -235,10 +234,10 @@ Helloworld-python app logs the context and the msg of the above event, and repli
{"msg":"Hi from Knative!"}
```
Play around with the CloudEvent attributes in the curl command and the trigger specification to understand how Triggers work.
Try the CloudEvent attributes in the curl command and the trigger specification to understand how [triggers](../../../broker-trigger.md#trigger) work.
## Verify reply from helloworld-python app
`helloworld-python` app replies back with an event of `type= dev.knative.samples.hifromknative`, and `source=knative/eventing/samples/hello-world`. This event enters the eventing mesh via the Broker and can be delivered to other services using a Trigger
The `helloworld-python` app replies with an event type `type= dev.knative.samples.hifromknative`, and source `source=knative/eventing/samples/hello-world`. The event enters the eventing mesh through the broker, and can be delivered to event sinks using a trigger
1. Deploy a pod that receives any CloudEvent and logs the event to its output.
```shell