Convert list of keys and list of values to a dictionary

Question

I have these lists:

list1 = ["a","b","c"]
list2 = ["1","2","3"]

I need to add them to a dictionary, where list1 is the key and list2 is the value.

I wrote this code:

d = {}
for i in list1:
    for j in list2:
        d[i] = j
print d

The output is this:

{'a':'3','b':'3','c':'3'}

What's wrong with this code? How can I write it so the output is

{'a':'1','b':'2','c':'3'}

Thanks!

Answer 1

Zip the lists and use a dict comprehension :

{i: j for i, j in zip(a, b)}

Or, even easier, just use dict() :

dict(zip(a, b))

You should keep it simple, so the last solution is the best, but I kept the dict comprehension example to show how it could be done.