On 10/22/2010 4:22 AM, Jan Kosinski wrote:
I have created a python module, which contains a bunch of utility
functions that use a number of global variables (directory and file
names, etc.).
I want to move that global variables to an external configuration
file and I want to load all global variables from that configuration
file when module is imported.
I am not sure which is the proper way of doing that. At the moment I
use the solution as in the following example, is it fine?
#my_module.py: import ConfigParser
config = ConfigParser.SafeConfigParser() config_f =
open('my_module.cfg') config.readfp(config_f) config_f.close()
global_var = config.get('section', 'global_var')
def some_func(): print global_var
#my_script.py: import my_module
my_module.some_func()
#my_module.cfg: [section] global_var = /tmp/
In general, it's a bad idea to do I/O during module import.
It's hard to deal with errors. If the program is running as a service,
the service isn't up yet, and if it's a GUI application, the GUI
isn't up yet. So error reporting tends to be poor.
If you have something with state, it's usually better to
define a class, and initialize a singleton instance of the class
from the main program, where you can handle errors.
John Nagle
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