list - Python, Grabbing information from a class object not working -

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I do not know what the reason for this error is, I do not know how to describe it without informing you Here is the relevant part of my code: 

  class node (object): def __init __ (self, content, children): self. Content = content itself Children = Children Deaf Head Node (District, Origin): new_contents = parent.contents new_contents.append (district) new = node (new_contents, []) parent.children.append (new) returns new root = node ([], [] Data = [[[1,1, 'R'], [1,2, 'D'], [1,2, 'R'], [1,4, 'D']] Download (data, Root)   
 Here's the problem: new.contents have been modified as planned, but this is also parent.contents. what happened?   
 
 
 As you have stated in your comment, you should  content  pf 'new_contents In 'parent.contents' Otherwise, you are reaching the list from the context, which is not obvious what its purpose is.  
 In this way, your 'MacNode' function may start as follows:  
  def makeNode (District, Guardian): new_content = copy.deepcopy (parent.contents ) ...   
 I hope, I can clear things for later readers ...;)

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