In Python, how do I split on either a space or a hyphen?

Input: 

You think we did this un-thinkingly?

Desired output:

["You", "think", "we", "did", "this", "un", "thinkingly"]

I can get as far as 

mystr.split(' ')

But I don't know how to split on hyphens as well as spaces and the Python definition of split only seems to specify a string. Do I need to use a regex?

python string formatting
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