Merge List Concating Unique Values As Comma Seperated Retaining Original Order From Csv

Here is my data: data.csv id,fname,lname,education,gradyear,attributes 1,john,smith,mit,2003,qa 1,john,smith,harvard,207,admin 1,john,smith,ft,212,master 2,john,doe,htw,2000,dev H

Solution 1:

The problem is sorting, which is not required. Change as:

groupby(t, lambda x:x[0])