Python inverse function of id(…) built-in function

Python inverse function of id(…) built-in function

https://stackoverflow.com/questions/24815771/python-inverse-function-of-id-built-in-function

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Is there a reverse or inverse of the id built-in function? 
I was thinking of using it to encode and decode string without taking too much time or having a lot of overhead like the PyCrypto library. 
The need for me is quite simple so I don't want to use PyCrypto for a simple encode and decode.

Something like:

>>> id("foobar")
4330174256
>>> reverse_id(4330174256) # some function like this to reverse.
"foobar"

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I do not wanna to steal the credits from the man who answered the question

This can be done easily by ctypes:

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

hello world
```