Find Unique Binary String LeetCode solution in Python

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class Solution(object):
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    def findDifferentBinaryString(self, nums):
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        ans = ""
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        for i, num in enumerate(nums):
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            ans += "1" if (num[i] == "0") else "0"  # ternary if else
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        # ans+= str(1- int(num[i]));              # Alternate: cast to string & 1-x to flip
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        return ans