### Setup and Run PubNub AsyncIO Subscriber (Shell)

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio_simple/README.md

Provides shell commands to install necessary Python packages (asyncio, pubnub), set environment variables for PubNub publish and subscribe keys, and execute the main Python script.

```shell
pip install asyncio pubnub
export PUBNUB_PUBLISH_KEY=demo
export PUBNUB_SUBSCRIBE_KEY=demo
python main.py
```

--------------------------------

### Installing PubNub Python SDK

Source: https://github.com/pubnub/python/blob/master/README.md

Use pip, the Python package installer, to add the PubNub SDK to your project dependencies.

```bash
pip install pubnub
```

--------------------------------

### Publish Message via Curl (Shell)

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio_simple/README.md

Demonstrates how to publish a test message to a PubNub channel using the curl command-line tool. It requires setting the PubNub publish and subscribe keys as environment variables.

```shell
export PUBNUB_PUBLISH_KEY=demo
export PUBNUB_SUBSCRIBE_KEY=demo
curl "https://ps.pndsn.com/publish/${PUBNUB_PUBLISH_KEY}/${PUBNUB_SUBSCRIBE_KEY}/0/my_channel/0/%22Hello%20World%22"
```

--------------------------------

### Configuring PubNub Python SDK

Source: https://github.com/pubnub/python/blob/master/README.md

Initialize the PubNub configuration object with your subscribe and publish keys, and optionally a unique UUID, then create the PubNub client instance.

```python
pnconfig = PNConfiguration()

pnconfig.subscribe_key = 'mySubscribeKey'
pnconfig.publish_key = 'myPublishKey'
pnconfig.uuid = 'myUniqueUUID'
pubnub = PubNub(pnconfig)
```

--------------------------------

### Publishing and Subscribing with PubNub Python

Source: https://github.com/pubnub/python/blob/master/README.md

Define a callback function to handle the result of a publish operation. Use the client's publish method to send a message to a channel and the subscribe method to listen for messages on one or more channels.

```python
def my_publish_callback(envelope, status):
  if status.is_error():
    ... #handle error here
  else:
    ... #handle result here

pubnub.publish().channel('my_channel').message('Hello world!').pn_async(my_publish_callback)

pubnub.subscribe().channels('my_channel').execute()
```

--------------------------------

### Listing Python Dependencies

Source: https://github.com/pubnub/python/blob/master/requirements-dev.txt

This snippet lists the Python packages required for the project, specifying minimum or exact versions. This format is commonly used in a requirements.txt file.

```Python
pyyaml>=6.0
pytest-cov>=6.0.0
pycryptodomex>=3.21.0
flake8>=7.1.2
pytest>=8.3.5
pytest-asyncio>=0.24.0
httpx>=0.28
h2>=4.1
requests>=2.32.2
aiohttp>=3.10.11
cbor2>=5.6
behave>=1.2.6
vcrpy>=6.0.2
urllib3>=1.26.19,<2
busypie>=0.5.1
```

--------------------------------

### Specify aiohttp Dependency (Python)

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/http/requirements.txt

Specifies the required version constraint for the aiohttp library.

```Python
aiohttp>=3.11.14
```

--------------------------------

### Specify Zipp Dependency in Python

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/fastapi/requirements.txt

Specifies the required zipp package and its version constraint, pinned to avoid a known vulnerability. This line is typically found in a requirements.txt file.

```Python
zipp>=3.19.1 # not directly required, pinned to avoid a vulnerability
```

--------------------------------

### Specify FastAPI Dependency in Python

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/fastapi/requirements.txt

Specifies the required FastAPI package and its minimum version constraint for the project. This line is typically found in a requirements.txt file.

```Python
fastapi>=0.115.11
```

--------------------------------

### Specify urllib3 Dependency (Python)

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/http/requirements.txt

Specifies the required version constraint for the urllib3 library, noted as not directly required but pinned for security.

```Python
urllib3>=1.26.19,<2 # not directly required, pinned to avoid a vulnerability
```

--------------------------------

### Specify Aiohttp Dependency in Python

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/fastapi/requirements.txt

Specifies the required aiohttp package and its version constraint, pinned to avoid a known vulnerability. This line is typically found in a requirements.txt file.

```Python
aiohttp>=3.11.14 # not directly required, pinned to avoid a vulnerability
```

--------------------------------

### Specify pubnub Dependency (Python)

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/http/requirements.txt

Specifies the required version constraint for the pubnub library.

```Python
pubnub>=10.1.0
```

--------------------------------

### Specify aiohttp-cors Dependency (Python)

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/http/requirements.txt

Specifies the required version constraint for the aiohttp-cors library.

```Python
aiohttp-cors>=0.8.0
```

--------------------------------

### Specify Urllib3 Dependency in Python

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/fastapi/requirements.txt

Specifies the required urllib3 package and its version constraint, pinned to avoid a known vulnerability. This line is typically found in a requirements.txt file.

```Python
urllib3>=1.26.19,<2 # not directly required, pinned to avoid a vulnerability
```

--------------------------------

### Specify PubNub Dependency in Python

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/fastapi/requirements.txt

Specifies the required PubNub package and its minimum version constraint for the project. This line is typically found in a requirements.txt file.

```Python
pubnub>=10.1.0
```

--------------------------------

### Adding PubNub Subscribe Listener in Python

Source: https://github.com/pubnub/python/blob/master/README.md

Create a class inheriting from SubscribeCallback to handle various events like status changes, presence updates, incoming messages, and signals. Register an instance of this class with the PubNub client.

```python
class SubscribeHandler(SubscribeCallback):
  def status(self, pubnub, event):
    print("Is there an error? ", event.is_error())
    print("Status value for category: %s" % event.category)
    print("Status value for error_data: %s" % event.error_data)
    print("Status value for error: %s" % event.error)
    print("Status value for status_code: %s" % event.status_code)
    print("Status value for operation: %s" % event.operation)
    print("Status value for tls_enabled: %s" % event.tls_enabled)
    print("Status value for uuid: %s" % event.uuid)
    print("Status value for auth_key: %s" % event.auth_key)
    print("Status value for origin: %s" % event.origin)
    print("Status value for client_request: %s" % event.client_request)
    print("Status value for client_response: %s" % event.client_response)
    print("Status value for original_response: %s" % event.original_response)
    print("Status value for affected_channels: %s" % event.affected_channels)
    print("Status value for affected_groups: %s" % event.affected_groups)

  def presence(self, pubnub, presence):
      pass  # Handle incoming presence data

  def message(self, pubnub, message):
      pass  # Handle incoming messages

  def signal(self, pubnub, signal):
      pass # Handle incoming signals

pubnub.add_listener(SubscribeHandler())
```

--------------------------------

### Specify requests Dependency (Python)

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/http/requirements.txt

Specifies the required version constraint for the requests library, noted as not directly required but pinned for security.

```Python
requests>=2.32.2 # not directly required, pinned to avoid a vulnerability
```

--------------------------------

### Specify Requests Dependency in Python

Source: https://github.com/pubnub/python/blob/master/examples/pubnub_asyncio/fastapi/requirements.txt

Specifies the required requests package and its version constraint, pinned to avoid a known vulnerability. This line is typically found in a requirements.txt file.

```Python
requests>=2.32.2 # not directly required, pinned to avoid a vulnerability
```

--------------------------------

### Enabling Daemon Mode - PubNub Python

Source: https://github.com/pubnub/python/blob/master/DEVELOPER.md

This snippet shows how to enable daemon mode for asynchronous requests in the PubNub Python SDK. By default, asynchronous requests block the main thread until completion. Setting this configuration option to `True` allows the main program execution to continue without waiting for child threads/requests to finish, similar to Java's daemon threads.

```python
pubnub.config.daemon = True
```

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