how to sort subset of rows in pandas df

1In [364]: df.sort_values(['id','t'], ascending=[1,0])
2Out[364]:
3   id   t  metric_1  metric_2  metric_3
44   0  90    13.333    61.993  0.017871
53   0  89    13.333    61.998  0.017746
62   0  88    13.333    61.992  0.017711
71   0  87    13.333    61.993  0.017569
80   0  86    13.333    61.989  0.017444
99   1  90    33.333    61.736  0.030689
108   1  89    26.667    61.802  0.025995
117   1  88    20.000    61.864  0.022475
126   1  87    20.000    61.913  0.020058
135   1  86    13.333    61.964  0.018511