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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 _groupname():
    '''
    Grain for the minion groupname
    '''
    if grp:
        try:
            groupname = grp.getgrgid(os.getgid()).gr_name
        except KeyError:
            groupname = ''
    else:
        groupname = ''

    return groupname