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add solution in Python for 0136_single_number.py

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Original file line number	Diff line number	Diff line change
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	`1`	`+def singleNumber(self, nums: List[int]) -> int:`
	`2`	`+ uniqueNumber = 0`
	`3`	`+ # Use XOR bitwise operation for every num in the array`
	`4`	`+ for i in range(len(nums)):`
	`5`	`+ uniqueNumber ^= nums[i]`
	`6`	`+ return uniqueNumber`

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