heapq python how to use comparator

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1class Solution:
2    def mergeKLists(self, lists: List[ListNode]) -> ListNode:
3        
4        setattr(ListNode, "__lt__", lambda self, other: self.val <= other.val)
5            
6        pq = []
7        for l in lists:
8            if l:
9                heapq.heappush(pq,  l)
10        
11        out = ListNode(None)
12        head = out
13        while pq:
14            l = heapq.heappop(pq)
15            head.next = l
16            head = head.next
17            if l and l.next:
18                heapq.heappush( pq, l.next)
19            
20        return out.next
21

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