How to print underscore variable in Python?

Question

My code

import numpy as np
from pylab import plot,show
import scipy
import scipy.cluster
from scipy.cluster.vq import kmeans, vq

data_sillet = np.loadtxt('clustering_sillet.txt', delimiter=',')
data = data_sillet.astype(int)

print (type(data))

centroids, _ = scipy.cluster.vq.kmeans(data.astype(float), 3)
idx, _ = vq(data,centroids)

How to print the whole content of throwaway variable not just print (centroids)?

_ is used as a garbage variable, something you don't care about, use a real name instead if this value matter — PRMoureu
– PRMoureu, Commented Aug 13, 2017 at 16:03
even so, what's wrong with print ( _ )? It's ugly, and as @PRMoureu said, if you care about a variable, don't call it _, but it's still a valid name. — Marcus Müller
– Marcus Müller, Commented Aug 13, 2017 at 16:04
_ is still a valid identifier, so there's nothing that would forbid printing it using print(_). — Tomáš Linhart
– Tomáš Linhart, Commented Aug 13, 2017 at 16:05
_ is a valid variable name. It's just a convention that _ is a 'throwaway' variable. — ForceBru
– ForceBru, Commented Aug 13, 2017 at 16:05
In a script, _ is just another variable. However, in the interactive interpreter it is special: it's bound to the result of the last unassigned expression. Eg, if you do 1+2<Enter> 3 gets printed, and if you then do _<Enter> 3 gets printed again, and if you then do _+5<Enter> 8 will be printed. — PM 2Ring
– PM 2Ring, Commented Aug 13, 2017 at 16:39

MarianD · Accepted Answer · 2017-08-13 16:05:26Z

5

Instead of

centroids, _ = scipy.cluster.vq.kmeans(data.astype(float), 3)

use

centroids, i_want_this = scipy.cluster.vq.kmeans(data.astype(float), 3)

and then print i_want_this.

answered Aug 13, 2017 at 16:05

MarianD

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1 Comment

MarianD Over a year ago

@DYZ - There are at least 3 good reasons for not do it: 1) not very descriptive name, 2) elusiveness, and 3) code maintaining.

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