We are looking at question 4.1 from Elements Of Programming Interviews in Python book.

Write expressions that uses bitwise operators, equality checks and boolean operators to test if x is a power of 2 in O(1) time.

Test if is a power of 2. i.e. evaluates to true for x = 1,2,4,8,16... false for all other values.

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Here is the video I created which walk you through the solution.