Channel Groups API for PubNub Python SDK

Channel groups allow PubNub developers to bundle thousands of channels into a group that can be identified by a name. These channel groups can then be subscribed to, receiving data from the many back-end channels the channel group contains.

Channel group operations

You can't publish to a channel group. You can only subscribe to it. To publish within the channel group, you need to publish to each channel individually.

Request execution and return values

You can decide whether to perform the Python SDK operations synchronously or asynchronously.

• .sync() returns an Envelope object, which has two fields: Envelope.result, whose type differs for each API, and Envelope.status of type PnStatus.

  pubnub.publish() \
      .channel("myChannel") \
      .message("Hello from PubNub Python SDK") \
      .sync()

• .pn_async(callback) returns None and passes the values of Envelope.result and Envelope.status to a callback you must define beforehand.

  def my_callback_function(result, status):
      print(f'TT: {result.timetoken}, status: {status.category.name}')
  
  pubnub.publish() \
      .channel("myChannel") \
      .message("Hello from PubNub Python SDK") \
      .pn_async(my_callback_function)

Add Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function adds a channel to a channel group.

Method(s)

Adding Channels is accomplished by using the following method(s) in the Python SDK:

Maximum number of channels

200 channels can be added to the channel group per API call.

pubnub.add_channel_to_channel_group() \
    .channels(String|List|Tuple) \
    .channel_group(String)

Parameter	Type	Required	Description
channels	String | List | Tuple	Yes	The channel to add to the channel_group.
channel_group	String	Yes	The channel_group to add the channels to.

Basic Usage

Add Channels

pubnub.add_channel_to_channel_group().\
    channels(["ch1", "ch2"]).\
    channel_group("cg1").\
    sync()

Returns

The add_channel_to_channel_group() operation returns an Envelope which contains the following fields:

Field	Type	Description
result	PNChannelGroupsAddChannelResult	A detailed object containing the result of the operation.
status	PNStatus	A status object with additional information.

PNChannelGroupsAddChannelResult

Channel successfully added

List Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function lists all the channels of the channel group.

Method(s)

Listing Channels is accomplished by using the following method(s) in the Python SDK:

pubnub.list_channels_in_channel_group() \
    .channel_group(String)

Parameter	Type	Required	Description
channel_group	String	Yes	The channel group to fetch channels.

Basic Usage

List Channels

pubnub.list_channels_in_channel_group() \
    .channel_group("cg1") \
    .sync()

Returns

The list_channels_in_channel_group() operation returns an Envelope which contains the following fields:

Field	Type	Description
result	PNChannelGroupsListResult	A detailed object containing the result of the operation.
status	PNStatus	A status object with additional information.

PNChannelGroupsListResult

Field	Type	Description
channels	Dictionary	A list of channels in a channel group.

Remove Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function removes the channels from the channel group.

Method(s)

Removing Channels is accomplished by using the following method(s) in the Python SDK:

pubnub.remove_channel_from_channel_group() \
    .channels(String|List|Tuple) \
    .channel_group(String)

Parameter	Type	Required	Description
channels	String | List | Tuple	Yes	The channels to remove from the channel group.
channel_group	String	Yes	Specifies channel_group to remove the channels from.

Basic Usage

Remove channels

pubnub.remove_channel_from_channel_group() \
    .channels(["son", "daughter"]) \
    .channel_group("channel_group") \
    sync()

Returns

The remove_channel_from_channel_group() operation returns an Envelope which contains the following fields:

Field	Type	Description
result	PNChannelGroupsRemoveChannelResult	A detailed object containing the result of the operation.
status	PNStatus	A status object with additional information.

PNChannelGroupsRemoveChannelResult

Channel successfully removed

Delete Channel Group

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function removes the channel group.

Method(s)

Deleting Channel Group is accomplished by using the following method(s) in the Python SDK:

pubnub.remove_channel_group(channel_group)

Parameter	Type	Required	Description
channel_group	String	Yes	The channel group to remove.

Basic Usage

Delete Channel Group

pubnub.remove_channel_group() \
    .channel_group("cg1") \
    .sync()

Returns

The remove_channel_group() operation returns an Envelope which contains the following fields:

Field	Type	Description
result	PNChannelGroupsRemoveGroupResult	A detailed object containing the result of the operation.
status	PNStatus	A status object with additional information.

PNChannelGroupsRemoveGroupResult

Group successfully removed