[英]How to get the number of combined unique values for two columns in pandas
Suppose I have a pandas data frame with 2 columns. 假设我有一个2列的pandas数据框。
I want to count the distinct or unique values for both columns - ie col1
having 1,3 and col2
having 2,4 ( 1
was already counted in col1
). 我想计算两列的不同值或唯一值-即
col1
具有1,3和col2
具有2,4( 1
已在col1
进行计数)。 My final output should be 4. 我的最终输出应该是4。
How can I achieve this? 我该如何实现?
tr=pd.DataFrame({"Col1":[1,1,1,1,3,3],"Col2":[1,2,2,2,4,4]})
print (tr)
As per @Vaishali's comment, you need: 根据@Vaishali的评论,您需要:
import pandas as pd
tr = pd.DataFrame({"Col1":[1,1,1,1,3,3],"Col2":[1,2,2,2,4,4]})
Out = tr.stack().nunique()
print(Out)
4
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