Easy to Understand in Python, beating 88% (Optimized)

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    Python is elegant, but slow at the same time.
    I spent a lot of time finding the bottlenecks, got a bunch of TLE in the process. Finally, well-optimized code beats 88%.

    class Solution(object):
        def findRightInterval(self, intervals):
            :type intervals: List[Interval]
            :rtype: List[int]
            import bisect
            s = {}
            for idx, interval in enumerate(intervals):
                s[interval.start] = idx
            ans = []
            key_sorted = sorted(list(s.keys()))
            for interval in intervals:
                idx = bisect.bisect_left(key_sorted, interval.end)
                ans.append(-1 if idx == len(s) else s[key_sorted[idx]])
            return ans

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