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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _get_journal():
    '''
    Return the active running journal object
    '''
    if 'systemd.journald' in __context__:
        return __context__['systemd.journald']
    __context__['systemd.journald'] = systemd.journal.Reader()
    # get to the end of the journal
    __context__['systemd.journald'].seek_tail()
    __context__['systemd.journald'].get_previous()
    return __context__['systemd.journald']