Single line for-loop to build a dictionary?

Question

I'm constructing a dictionary (which I'll later make into a JSON string). I construct it like this:

data = {}
for smallItem in bigList:
    data[smallItem] = smallItem

How can I make that for loop one line?

Solution

Actually in this specific case you don't even need a dictionary comprehension since you are using duplicate key/value pairs

>>> bigList = [1, 2, 3, 4, 5]
>>> dict(zip(bigList, bigList))
{1: 1, 2: 2, 3: 3, 4: 4, 5: 5}