Delete item in a list using a for-loop

Question

I have an array with subjects and every subject has connected time. I want to compare every subjects in the list. If there are two of the same subjects, I want to add the ti

Answer 1

An alternate way would be to create the subject and time lists anew, using a dict to sum up the times of recurring subjects (I am assuming subjects are strings i.e. hashable).

subjects=['math','english','necromancy','philosophy','english','latin','physics','latin']
time=[1,2,3,4,5,6,7,8]
tuples=zip(subjects,time)
my_dict={}
for subject,t in tuples:
    try:
        my_dict[subject]+=t
    except KeyError:
        my_dict[subject]=t
subjects,time=my_dict.keys(), my_dict.values()
print subjects,time