How to Retrieve an Object in Python by its ID?

Obtaining an Object by Its ID

In Python, it's possible to retrieve the unique numeric identifier of an object using the id() function. However, obtaining the object itself based on its ID can be a tricky task.

One approach to retrieve an object given its ID is through the use of the ctypes library. The following code snippet demonstrates this method:

import ctypes
a = "hello world"
print(ctypes.cast(id(a), ctypes.py_object).value)

Output:

hello world

This technique works when the object still exists in memory. However, it's important to note that relying on this method can lead to undefined behavior or crashes if the object has been deleted or overwritten. Therefore, it should be used with caution.

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