How to get rid of try

getridoftry.py

dupl = []
for xyz in xyz_array:
    try:
        i = [y[0] for y in dupl].index(xyz[:-1])
    except:
        i = False
    if not i:
        dupl.append([xyz[:-1], xyz[2:], 1])
    else:
        dupl[i][1]+=xyz[2:]
        dupl[i][2]+=1