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Is there a copy constructor in python ? If not what would I do to achieve something similar ?
The situation is that I am using a library and I have extended one of the classes there with extra functionality and I want to be able to convert the objects I get from the library to instances of my own class.
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you can control copying in much the same way as you control pickle. deepcopy works well for doing this external to the class definition. But @Zitrax wants to do this within his class definition so that the new instance inherits the attributes (data) from an object of a different (parent) type (class).
Copy Constructor is called in the following scenarios: When we initialize the object with another existing object of the same class type. For example, Student s1 = s2, where Student is the class. When the object of the same class type is passed by value as an argument.
Copy List Python: copy() Method. The Python copy() method creates a copy of an existing list. The copy() method is added to the end of a list object and so it does not accept any parameters. copy() returns a new list.
Copy Constructor in C++ A copy constructor is a member function that initializes an object using another object of the same class. A copy constructor has the following general function prototype: ClassName (const ClassName &old_obj);
I think you want the copy module
import copy x = copy.copy(y) # make a shallow copy of y x = copy.deepcopy(y) # make a deep copy of y you can control copying in much the same way as you control pickle.
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