How Can I Retrieve an Object Using Its ID in Python?

How to Retrieve an Object from its ID?

To obtain an object's ID, you can use the id() function. However, if you wish to retrieve the original object given its ID, you can leverage the ctypes library.

Solution using ctypes:

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

This snippet employs the ctypes.cast() method to convert the object's ID to a Python object, which is then accessible as value.

Important Note:

It's crucial to bear in mind that this solution is only valid if the object is still extant. Attempting to retrieve objects that are no longer in memory may result in unpredictable behavior and severe crashes, so caution is advised.

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