human
Complete the below
@mock_streams('stdout')
def test_global_parallel_honors_runs_once():

    ''''fab -P (or env.parallel) should honor @runs_once'
    '''
 ... What is a the Python program you requested?
assistant
#Here is the Python program you requested.
    @decorators.runs_once
    def mytask():
        print 'yolo'
    with settings(hide('everything'), parallel=True):
        execute(mytask, hosts=['localhost', '127.0.0.1'])
    result = sys.stdout.getvalue()
    eq_(result, 'yolo\n')
    assert (result != 'yolo\nyolo\n')