How do i Clone an object?

[Fuugie]

I am having trouble trying to clone a tree i made. Any suggestions?

My Input:

from cs1graphics import *
 
paper = Canvas(300, 200, 'skyBlue', 'My Forest')
 
grass = Rectangle(300, 80, Point(150,160))
grass.setFillColor('green')
grass.setBorderColor('green')
grass.setDepth(75)                
paper.add(grass)
 
tree1 = ('tree', 'tree_bottom', 'tree_base')
tree = Polygon(Point(50,80), Point(30,125), Point(70,125))
tree.setFillColor('darkGreen')
paper.add(tree)
 
tree_bottom = Polygon(Point(50,80), Point(30,150), Point(70,150))
tree_bottom.setFillColor('darkGreen')
paper.add(tree_bottom)
 
tree_base = Polygon(Point(50,150), Point(45,165), Point(55,165))
tree_base.setFillColor('brown')
paper.add(tree_base)
 
tree2 = tree1.clone()
tree2.move(170,30)
tree2.scale(1.2)
paper.add(tree2)
 

Error:

Traceback (most recent call last):
  File "C:/Users/Robert/Documents/CSIS Projects/Ex3_8.py", line 30, in <module>
    tree2 = tree1.clone()
AttributeError: 'tuple' object has no attribute 'clone'
 

[bvdet]

I can see how you got the error. This will not work, because a tuple object has no method named clone:

tree1 = ('tree', 'tree_bottom', 'tree_base')
tree2 = tree1.clone()

What is tree2 supposed to be?

[dwblas]

"clone" is too vague. You have at least 2 options with a tuple/list
tree2 = tree1
creates a reference to tree1, i.e. they both point to the same block of memory, so if you change one, you change both. For a copy, you have to convert to a list.

import copy
tree1 = ('tree', 'tree_bottom', 'tree_base')
tree2 = tree1
print tree2
print id(tree2), id(tree1)   ## they are the same
 
tree3 = copy.copy(list(tree1))   ## shallow copy (look it up)
print tree3
print id(tree3), id(tree1)   ## they are different