old_contents: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  def kruskal():
  	"""Kruskal's Minimum Spanning Tree in weighted graph."""
  	pass
  
  
  def main():
  	pass
  
  
  if __name__ == '__main__':
  	main()
  
new_contents: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  def kruskal():
  	"""Kruskal's algorithm for minimum spanning tree in weighted graph.
  
      Time complexity for graph G(V, E): TBD.
  	"""
  	pass
  
  
  def main():
  	pass
  
  
  if __name__ == '__main__':
  	main()
  
subject: Revise doc string