def _init_session(cls, session=None):
# type: (Optional[Session]) -> Session
"""Initialise the given session and load class cookies to its jar.
Arguments:
session (~requests.Session, optional): a `requests`
session, or `None` to create a new one.
Returns:
~requests.Session: an initialised session instance.
"""
session = session or Session()
# Load cookies
session.cookies = LWPCookieJar(
cls._cachefs.getsyspath(cls._COOKIE_FILE))
try:
typing.cast(FileCookieJar, session.cookies).load()
except IOError:
pass
typing.cast(FileCookieJar, session.cookies).clear_expired_cookies()
return session
