The code in the editor copies the dictionary in a safe manner.
Run it to get the following output:
Deep copy
Hello from __init__()
Memory chunks: 43986504 43986696
Same memory chunk? False
Let's modify the movies list
a_example.properties: ['112', '997']
b_example.properties: ['112', '997', '911']
output
Pay attention to the fact that the __init__() method is executed only once, despite the fact we own two instances of the example class.
This method is not executed for the b_example object as the deepcopy function copies an already initialized object.
Code
import copyclass Example:
def __init__(self):
self.properties = ["112", "997"]
print("Hello from __init__()")
a_example = Example()
b_example = copy.deepcopy(a_example)
print("Memory chunks:", id(a_example), id(b_example))
print("Same memory chunk?", a_example is b_example)
print()
print("Let's modify the movies list")
b_example.properties.append("911")
print('a_example.properties:', a_example.properties)
print('b_example.properties:', b_example.properties)
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