python - Counting first appearance of a field in a CSV file -


using format of following csv file:

pos   id    name 1   0001l01 50293 2   0002l01 128864 3   0003l01 172937 4   0004l01 12878 5   0005l01 demo 6   0004l01 12878 7   0004l01 12878 8   0005l01 demo

i want include in dictionary: [id], {pos, name, firsttime} firsttime corresponds position id first appears in csv file. instance id = 0005l01 have: [0005l01],{5,demo,5},{8,demo,5}

i have managed store [id], {pos,name} struggling firsttime. far i've got:

 # csv reader, save list  dlist=[]  row in reader:       # store non empty lines       if any(row):          dlist.append(row) d={} row in dlist:     d.setdefault(row[1],[]).append([row[0],row[2]])

it's easier if compute firsttime first, , fill dictionary:

# csv reader, save list dlist=[] row in reader:     # store non empty lines     if any(row):         dlist.append(row) firsttime={} row in dlist:     if row[1] not in firsttime: firsttime[row[1]] = row[0] d={} row in dlist:     d.setdefault(row[1],[]).append([row[0],row[2],firsttime[row[1]]])

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