df = pandas.DataFrame({'a': [1, 0, 0, 0]})
df.groupby(pandas.cut(df.a, [0, 1, 2, 3, 4])).apply(lambda x: len(x))
Out[3]:
a
(0, 1] 1
(1, 2] 0
(2, 3] 0
(3, 4] 3
dtype: int64
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