class Interval(object):
     def __init__(self, s=0, e=0):
         self.start = s
         self.end = e
 
class Solution(object):
    def canAttendMeetings(self, intervals):
        """
        :type intervals: List[Interval]
        :rtype: bool
        """
        intervals.sort()
 
        for i in range(1, len(intervals)):
            if intervals[i].start < intervals[i-1].end:
                return False
 
        return True       
 
B = Solution()
print B.canAttendMeetings([Interval(20,30),Interval(25,30)])  
 

Y2xhc3MgSW50ZXJ2YWwob2JqZWN0KToKICAgICBkZWYgX19pbml0X18oc2VsZiwgcz0wLCBlPTApOgogICAgICAgICBzZWxmLnN0YXJ0ID0gcwogICAgICAgICBzZWxmLmVuZCA9IGUKCmNsYXNzIFNvbHV0aW9uKG9iamVjdCk6CiAgICBkZWYgY2FuQXR0ZW5kTWVldGluZ3Moc2VsZiwgaW50ZXJ2YWxzKToKICAgICAgICAiIiIKICAgICAgICA6dHlwZSBpbnRlcnZhbHM6IExpc3RbSW50ZXJ2YWxdCiAgICAgICAgOnJ0eXBlOiBib29sCiAgICAgICAgIiIiCiAgICAgICAgaW50ZXJ2YWxzLnNvcnQoKQoKICAgICAgICBmb3IgaSBpbiByYW5nZSgxLCBsZW4oaW50ZXJ2YWxzKSk6CiAgICAgICAgICAgIGlmIGludGVydmFsc1tpXS5zdGFydCA8IGludGVydmFsc1tpLTFdLmVuZDoKICAgICAgICAgICAgICAgIHJldHVybiBGYWxzZQoKICAgICAgICByZXR1cm4gVHJ1ZSAgICAgICAKCkIgPSBTb2x1dGlvbigpCnByaW50IEIuY2FuQXR0ZW5kTWVldGluZ3MoW0ludGVydmFsKDIwLDMwKSxJbnRlcnZhbCgyNSwzMCldKSAgCg==