Zip two lists in dictionary but keep duplicates in key

Question

I have two lists:

alist = ['key1','key2','key3','key3','key4','key4','key5']

blist=  [30001,30002,30003,30003,30004,30004,30005]

I want to merge these lists and add them to a dictionary.

I try dict(zip(alist,blist)) but this gives:

{'key3': 30003, 'key2': 30002, 'key1': 30001, 'key5': 30005, 'key4': 30004}

The desired form of the dictionary is:

{'key1': 30001, 'key2': 30002, 'key3': 30003,'key3':30003, 'key4': 30004, 'key4': 30004, 'key5': 30005}

I want to keep the duplicates in the dictionary as well as not join the values in the same key (... key3': 30003,'key3':30003,... ).Is it possible?

Thanks in advance.

user_1588032 · Answer

Great answer by @MoinuddinQuadri. I expanded it further to get the index as well:

my_dict = defaultdict(list)
for idx, tup in enumerate(zip(alist, blist)):
    my_dict[tup[0]].append((idx, tup[1])