Programming Forums - Update a Module

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- - Update a Module (http://www.programmingforums.org/showthread.php?t=9586)

Is there a way to update a variable in a module from the program that imported this module? So other programs importing this module later can also use the update.

Make the variable stored in a data file? Then the module will open the data file everytime it is loaded/called to use that variable?

You can use the shelve or pickle modules to maintain persistant variables. The __file__ variable contains the filepath of the currently executing module. Combine the two, and you could have something like:

import shelve

import os



# Open a shelve file in the same directory as the module

filename = os.path.join(os.path.dirname(__file__), "data.shelf")

shelf = shelve.open(filename)



# Store a variable in the file:

shelf["something"] = 10



# Retrieve a variable from the file:

print shelf["foobar"]



# Delete a variable

del shelf["old"]