test

a.rb

import numpy
#data = numpy.random.random(100)
bins = numpy.linspace(15, 100, 5)
group_names = ['1', '2', '3', '4','5']
#digitized = numpy.digitize(df_all['age'], bins)
categories = pd.cut(df_all['age'], bins, labels=group_names)
df['categories'] = pd.cut(df['postTestScore'], bins, labels=group_names)
categories
#bin_means = [data[digitized == i].mean() for i in range(1, len(bins))]
#df_all['age']