Is it possible to have an actual memory leak in pure Python? (2010)

[lnyan]

https://stackoverflow.com/questions/2017381/is-it-possible-to-have-an-actual-memory-leak-in-python-because-of-your-code/2017431

[trinovantes]

What tools do people use in practice, if any, to detect these memory leaks like circular references? Or it easier to just simply restart the application every so often and not worry about it?