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Question: How do I share global variables across modules?

Answer: The canonical way to share information across modules within a single program is to create a special module (often called config or cfg). Just import the config module in all modules of your application; the module then becomes available as a global name. Because there is only one instance of each module, any changes made to the module object get reflected everywhere. For example:

config.py:
x = 0 # Default value of the 'x' configuration setting
mod.py:
import config
config.x = 1

main.py:
import config
import mod
print config.x

Note that using a module is also the basis for implementing the Singleton design pattern, for the same reason.

The canonical way to share information across modules within a single program is to create a special module (often called config or cfg). Just import the config module in all modules of your application; the module then becomes available as a global name. Because there is only one instance of each module, any changes made to the module object get reflected everywhere. For example:

config.py:
x = 0 # Default value of the 'x' configuration setting
mod.py:
import config
config.x = 1

main.py:
import config
import mod
print config.x

Note that using a module is also the basis for implementing the Singleton design pattern, for the same reason. Source: CoolInterview.com

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