如何将一个CSV文件中的列值从文件中的某个点附加到另一个CSV文件中

I have two files 1. Cleaned.csv, columns: SVM_LABEL, text( having 1:499 training data, 500:650 test data) 2. result.csv, columns:SVM_LABEL, SVM_PROB( SVM_LABEL for test data)I have two files 1. Cleaned.csv, columns: SVM_L