Better binning in pandas [duplicate]

Answer 1

Perhaps you are looking for pandas.cut:

import pandas as pd
import numpy as np

df = pd.DataFrame(np.arange(50), columns=['filtercol'])
filter_values = [0, 5, 17, 33]   
out = pd.cut(df.filtercol, bins=filter_values)
counts = pd.value_counts(out)
# counts is a Series
print(counts)

yields

(17, 33]    16
(5, 17]     12
(0, 5]       5

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To reorder the result so the bin ranges appear in order, you could use

counts.sort_index()

which yields

(0, 5]       5
(5, 17]     12
(17, 33]    16

Thanks to nivniv and InLaw for this improvement.

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See also Discretization and quantiling.