Now we provide two entry for operate YouTube DATA API.

• Use Api from pyyoutube import Api: This is an old implementation used to be compatible with older versions of code.
• Use Client from pyyoutube import Client: This is a new implementation for operating the API and provides additional capabilities.

from pyyoutube import Api

api = Api(api_key="your key")
api.get_channel_info(channel_id="id for channel")
# ChannelListResponse(kind='youtube#channelListResponse')

You can get more examples at this.

from pyyoutube import Client

cli = Client(api_key="your key")
cli.channels.list(channel_id="UC_x5XG1OV2P6uZZ5FSM9Ttw")
# ChannelListResponse(kind='youtube#channelListResponse')

You can get more examples at this.