Correction for the fix for Bug 3508 - Persistent storage support breaks Linux compatibility.
A 2nd `make install' will fail attempting to create symlink libnvmemmory.so already created by 1st install.
Install should pre-emptively delete it.
Examples of classes that implement special operators (see reference manual):
Complex.py Complex numbers
Dates.py Date manipulation package by Tim Peters
Dbm.py Wrapper around built-in dbm, supporting arbitrary values
Range.py Example of a generator: re-implement built-in range()
Rev.py Yield the reverse of a sequence
Vec.py A simple vector class
bitvec.py A bit-vector class by Jan-Hein B\"uhrman
(For straightforward examples of basic class features, such as use of
methods and inheritance, see the library code.)