Given a CSV file, how can we replace the values in one of the columns?
For example given this file:
170,test,best,one,0.1314 171,test,best,two,0.1695 172,test,best,two,0.1784 173,test,best,three,0.3748
how can we replace the 4th column to contain the value 'CIS' in every line?
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