When I use python shelve on Ubuntu, it saves to a file without extension. But when I use it on CentOS, 3 files appears with extensions .bac .dat and .dir. What happens here and how to make them consistent?
shelve uses behind the scene the dbm module, which in turns uses some native dbm bindings depending on the OS.
Citing the docs:
dbm is a generic interface to variants of the DBM database — dbm.gnu or dbm.ndbm. If none of these modules is installed, the slow-but-simple implementation in module dbm.dumb will be used.
Therefore, depending on the OS you are using and what's installed on it, it might be saved in different ways.
Shameful self-promotion: I made an alternative for shelve which you may find handy since it is platform independent: https://github.com/dagnelies/pysos