由于我主要想按7天（也就是一周）进行分组，因此我现在使用此方法来找到所需的箱：
from pandas.tseries.offsets import Week
# Let's not make full weeks
hours = 24*6*4
rng = pd.date_range('2016-06-01', periods=hours, freq='H')
# Set week start to whatever the last weekday of the range is
print("Last day is %s" % rng[-1])
freq = Week(weekday=rng[-1].weekday())
ones = pd.Series([1]*hours, rng)
rdf = pd.DataFrame({'a': ones})
rdf.groupby(pd.TimeGrouper(freq=freq, closed='right', label='right')).sum()
这给了我想要的输出
2016-06-25 96
2016-07-02 168
2016-07-09 168
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