pandas 计算pandas中一列中唯一行的总数

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时间:2020-09-14 04:35:53  来源:igfitidea点击:

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

pythonpandasdataframe

提问by ubuntu_noob

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 :

这给出了输出:

2 3
3 2
5 2

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

但我想要答案,3因为那是列中行的唯一值数node1

回答by ubuntu_noob

Thanks @Zero

谢谢@零

df['node1'].nunique()

This works for my answer

这适用于我的答案