session.py 文件源码

def get_credentials(self):
        """
        Return the :class:`botocore.credential.Credential` object
        associated with this session.  If the credentials have not
        yet been loaded, this will attempt to load them.  If they
        have already been loaded, this will return the cached
        credentials.

        """
        if self._credentials is None:
            self._credentials = self._components.get_component(
                'credential_provider').load_credentials()
        return self._credentials