session.py 文件源码

def __init__(self, aws_access_key_id=None, aws_secret_access_key=None,
                 aws_session_token=None, region_name=None,
                 botocore_session=None, profile_name=None):
        if botocore_session is not None:
            self._session = botocore_session
        else:
            # Create a new default session
            self._session = botocore.session.get_session()

        # Setup custom user-agent string if it isn't already customized
        if self._session.user_agent_name == 'Botocore':
            botocore_info = 'Botocore/{0}'.format(
                self._session.user_agent_version)
            if self._session.user_agent_extra:
                self._session.user_agent_extra += ' ' + botocore_info
            else:
                self._session.user_agent_extra = botocore_info
            self._session.user_agent_name = 'Boto3'
            self._session.user_agent_version = boto3.__version__

        if profile_name is not None:
            self._session.set_config_variable('profile', profile_name)

        if aws_access_key_id or aws_secret_access_key or aws_session_token:
            self._session.set_credentials(
                aws_access_key_id, aws_secret_access_key, aws_session_token)

        if region_name is not None:
            self._session.set_config_variable('region', region_name)

        self.resource_factory = ResourceFactory(
            self._session.get_component('event_emitter'))
        self._setup_loader()
        self._register_default_handlers()