Python Converting A List Into A Dict With A Value Of 1 For Each Key

I have: somelist = ['a', 'b', 'c', 'd'] I want it so that, the list would convert to a dict somedict = {'a' : 1, 'b' : 1, 'c' : 1, 'd' : 1} So I did: somedict = dict(zip(somelis

Solution 1:

You can just use fromkeys() for this:

somelist = ['a', 'b', 'c', 'd']
somedict = dict.fromkeys(somelist, 1)

You can also use a dictionary comprehension (thanks to Steven Rumbalski for reminding me)

somedict = {x: 1 for x in somelist}

fromkeys is slightly more efficient though, as shown here.

>>>timeit('{a: 1 for a in range(100)}')
6.992431184339719
>>>timeit('dict.fromkeys(range(100), 1)')
5.276147376280434