Programming Forums > Script Programming > Python

Dietrich · Apr 29th, 2006, 9:58 AM

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.

Sane · Apr 29th, 2006, 10:13 AM

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?

Arevos · Apr 29th, 2006, 2:19 PM

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:

(Toggle Plain Text)

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"]

Apr 29th, 2006, 9:58 AM	#1
Dietrich Professional Programmer Join Date: Feb 2005 Posts: 434 Rep Power: 4	Update a Module 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. __________________ I looked it up on the Intergnats!

Apr 29th, 2006, 2:19 PM	#3
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 5	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: (Toggle Plain Text) 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"] 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"]

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Apr 29th, 2006, 10:13 AM	#2
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,086 Rep Power: 6	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?

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Programming Forums > Script Programming > Python

Update a Module