Count the total number of unique rows in a column in pandas

Question

data = { 
        'node1': [2,2,2,3,3,5,5],
        'node2': [8,16,22,5,25,10,77],
        'weight': [1,1,1,1,1,1,1], }
df = pd.DataFrame(data, columns = ['node1','node2','weight'])

print df["node1"].value_counts()

This gives the output as :

2 3
3 2
5 2

But I desire the answer 3 as that is the number of unique values of rows in column node1

thanks I couldnt find this command. – ubuntu_noob Oct 07 '17 at 15:42 — ubuntu_noob, Oct 07 '17 at 15:42

score 1 · Accepted Answer · answered Oct 07 '17 at 15:44

1

Thanks @Zero

df['node1'].nunique()

This works for my answer

answered Oct 07 '17 at 15:44

ubuntu_noob

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Count the total number of unique rows in a column in pandas

1 Answers1