python copy variable

>>> import copy
>>> a = 0
>>> b = 2
>>> a = copy.copy(b)
>>> b += 1
>>> a
2
>>> b
3

# importing copy module 
import copy 
  
# initializing list 1  
li1 = [1, 2, [3,5], 4] 
  
  
# using copy for shallow copy   
li2 = copy.copy(li1)  
  
# using deepcopy for deepcopy   
li3 = copy.deepcopy(li1)  

class Foo:
    def __init__(self, orig=None):
        if orig is None:
            self.non_copy_constructor()
        else:
            self.copy_constructor(orig)
    def non_copy_constructor(self):
        # do the non-copy constructor stuff
    def copy_constructor(self, orig):
        # do the copy constructor

a=Foo()  # this will call the non-copy constructor
b=Foo(a) # this will call the copy constructor