Merge nested list items based on a repeating value

Question

Although poorly written, this code:

marker_array = [[\'hard\',\'2\',\'soft\'],[\'heavy\',\'2\',\'light\'],[\'rock\',\'2\',\'feather\'],[\'fast\',\'3\'], [\'turtl         


        

Answer 1

marker_array = [['hard','2','soft'],['heavy','2','light'],['rock','2','feather'],['fast','3'], ['turtle','4','wet']]
marker_array_DS = []
marker_array_hit = []

for i in range(len(marker_array)):
    if marker_array[i][1] not in marker_array_hit:
        marker_array_hit.append(marker_array[i][1])

for i in marker_array_hit:
    lists = [item for item in marker_array if item[1] == i]
    temp = []
    first_part = ' '.join([str(item[0]) for item in lists])
    temp.append(first_part)
    temp.append(i)
    second_part = ' '.join([str(item[2]) for item in lists if len(item) > 2])
    if second_part != '':
        temp.append(second_part);
    marker_array_DS.append(temp)

print marker_array_DS

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