Sequence of 1 and 0 bits of python

In java, to get a sequence of 1s and 0s as a binary number, you can do the following

(-1 << (4))

      

        
        
        
      

    

while i give the result

11110000

      

        
        
        
      

    

Since python doesn't support signed ints, what's the equivalent way to do it in python? Ideally I would prefer to do this without any external library.