[Python]Merge Intervals

Given a collection of intervals, merge all overlapping intervals.

For example,
Given [1,3],[2,6],[8,10],[15,18],
return [1,6],[8,10],[15,18].

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# Definition for an interval.
# class Interval(object):
#     def __init__(self, s=0, e=0):
#         self.start = s
#         self.end = e

class Solution(object):
    def merge(self, intervals):
        """
        :type intervals: List[Interval]
        :rtype: List[Interval]
        """
        s=[]
        intervals.sort(key=lambda x:x.start)
        length=len(intervals)
        if length==0:
            return s
        s.append(intervals[0])
        for i in range(1,length):
            s_length=len(s)
            if s[s_length-1].end>=intervals[i].start:
                if s[s_length-1].end<intervals[i].end:
                    s[s_length-1].end=intervals[i].end
            else:
                s.append(intervals[i])
        return s