How Can I Prevent Shared Class Data Among Python Instances?

Avoiding Shared Class Data Among Instances

When constructing classes in Python, it's essential to understand the potential for shared data among instances. By default, class attributes, such as lists, are shared across all instances, leading to unintended behavior.

To overcome this challenge and achieve the desired behavior, where each instance has its own separate list, you should declare the list within the class's __init__ method. This method is called when an object is initialized, allowing you to create a new instance of the list for each object.

The following code snippet demonstrates this approach:

class a:
    def __init__(self):
        self.list = []

By declaring the list within the __init__ method, you ensure that each instance has its own distinct list. This way, modifying the list in one instance will not affect the list in other instances.

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