Prev: ANN: esky v0.4.0 [was Re: Upgrading Py2exe App]
Next: How to get memory and CPU status of a particular process
From: Brad Harms on 23 Feb 2010 01:58 On Mon, 22 Feb 2010 09:10:38 -0800, Alex Quinn wrote: > Is there a way to have some kind of database (i.e. sqlite3, bsddb, dbm, > etc.) that works out of the box on any Win/Linux/Mac machine with Python > 2.6+ or 3.x? It's okay if the file format is different between machines, > but I want my script to work without having to install anything. > > Problems with current modules: > > * Shelve used to do this. Unfortunately, since bsddb was > deprecated/removed from the standard distro and Windows doesn't have dbm > or gdbm, the only remaining option on Windows is dumbdbm, which is > discouraged in the docs. > > * Sqlite3 should fill the void now. However, in my experience, nearly > every Linux Python install I encounter has a broken sqlite3 module > ("ImportError: No module named _sqlite3"). It's a well-documented issue, > but it the solution generally requires root access, which I don't have > on these servers. > > Potential solutions: > > * Could I somehow bundle with my project the _sqlite3.so file and/or > whatever else it needs? Or is there an alternate sqlite3 module I could > use as a fallback that would just interface with the sqlite3 executable > on the machine (i.e. /usr/local/bin/sqlite3)? > > * Is there a way to drop bsddb into my project so it works out of the > gate (no install) on either Linux, Windows, or Mac? > > If you have any ideas, I'd be most appreciative. My objective here is > just to find a portable and reliable solution that I can use for small > projects. > > Thanks, > Alex Hi, I'm speaking with little experience here, but one thought I had is to try compiling Pysqlite ( http://pypi.python.org/pypi/pysqlite/2.5.6 ) for each of your target OS's, probably using GCC cross compilers for the platforms you aren't compiling on, then sort of "splice" them together so that _sqlite3 always points to the binary for the current OS. This snippet might help you get started: import sys # Linux binary if 'linux' in sys.platform.lower(): import _sqlite3_linux as _sqlite3 # Windows binary elif 'win32' == sys.platform: import _sqlite3_windows as _sqlite3 # Mac binary elif 'darwin' == sys.platform: import _sqlite3_mac as _sqlite3 sys.modules['_sqlite3'] = _sqlite3 I'm not exactly sure when you would run this code. It would have to be sometime before you import the main sqlite3 module. -- Brad Harms -- http://alphaios.net |