base接受一个float参数。除了分钟，您还必须考虑秒。
base = ts.index[0].minute + ts.index[0].second/60
ts.groupby(pd.Grouper(freq=interval, base=base)).size()
2011-01-01 00:05:30 600
2011-01-01 00:15:30 600
2011-01-01 00:25:30 600
2011-01-01 00:35:30 600
2011-01-01 00:45:30 600
2011-01-01 00:55:30 600
Freq: 10T, dtype: int64
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