Sorting array of objects by attribute

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Python

sorting

I have a class, as defined below:

class Node():
    
  def _init_(self, xcoordinate= None, ycoordinate= None, h=None, g=None, cost=None):
        self.xcoordinate = xcoordinate
        self.ycoordinate = ycoordinate
        self.h = h
        self.g = g
        self.cost = h + g
        
    def _repr_(self):
        return repr((self.xcoordinate, self.ycoordinate, self.h, self.g, self.cost))

I then have an array of Node objects. How do I sort this array based on the Node.cost?(the objects cost attribute).

What I have tried:

I have tried using the line below

sorted(possible_next_steps, key=lambda node: node[4])

but that throws an "IndexError: tuple index out of range" error. I would really appreciate your help, thanks.