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add solution in Python for 0231_power_of_two.py

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Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+def isPowerOfTwo(self, n: int) -> bool:`
	`2`	`+ # Here bitwise operation is used (specifically AND)`
	`3`	`+ return n > 0 and (n & n - 1) == 0`

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