class_docstr: A pairing heap.
class_docstr_tok: ["A","pairing","heap","."]
code: def min(self):
      if self._root is None:
          raise nx.NetworkXError("heap is empty.")
      return (self._root.key, self._root.value)
  
imports: from heapq import heappop, heappush
  from itertools import count
  import networkx
label_desc: Use image node_id 2 for calling the PairingHeap obj's underlying member method code with example usage: obj.min() and returns: self,  self