_sessions = {}

def close_sessions(**kwargs):
    while _sessions:
        _sessions.popitem()[1].close()

def close_sessions(**kwargs):
    for url, session in _sessions.items():
        del _sessions[url]
        session.close()

def close_sessions(**kwargs):
    for session in _sessions.itervalues():
        session.close()
    _sessions.clear()

def close_sessions(**kwargs):
    for url in _sessions.keys():
        _sessions.pop(url).close()

close_sessions = lambda **kw: [s.close() for s in _sessions.itervalues()] and _sessions.clear()

close_sessions = lambda **kw: [_sessions.pop(url).close() for url in _sessions.keys()]