Wednesday, February 18, 2009

Various ways to have data in a file

1) Simple text file using open()
pros: Anybody can do it
cons: Not Pythonic
2) Write data as a Python script, import it to read
pros: Pythonic, flexible
cons: .pyc file may cause problem on some occasion. The user needs to know at least basic Python script.
3) XML
pros: Any programming language has XML parsers. Python has one in the std modules.
cons: XML is Ugly.
pros: Much more human eyes friendly than XML.
cons: Not yet well known, not in the std modules in Python, maybe 2) is enough?
5) pickle
pros: Good for storing Python generated data, std module.
cons: None
6) shelf
pros: Good for storing key-value data, std module.
cons: Somehow it doesn't seem useful to me.
7) sqlite3
pros: Can be used as a simple database, std module (Python version >=2.5).
cons: Need to know SQL (A friend of mine recommends sqlalchemy but I haven't used it yet)
8) zodb
pros: Support redo/undo, Object database (reconstruct references).
cons: Not in the std modules, Not good for very frequent write accesses (slow).
pros: Same as YAML.
cons: Same as YAML.

What else?


syoyo said...

I vote 2). Write data in python script seems a good idea.

hohehohe2 [at] said...

Hi syoyo san konchi ha-

It's my favourite too. It's especially good for user preference files. One bad thing with this which I didn't mention is that it can be a potential security risk.

syoyo said...

Hmm, but for the use of CG(e.g. 3D scene file), considering security problem might be less important.

Another candidate is JSON.

hohehohe2 [at] said...

That's one good thing about CG programming ;)