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The __debug__ variable is handy in part because it affects every module. If I want to create another variable that works the same way, how would I do it?
The variable (let's be original and call it 'foo') doesn't have to be truly global, in the sense that if I change foo in one module, it is updated in others. I'd be fine if I could set foo before importing other modules and then they would see the same value for it.
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The best way to share global variables across modules across a single program is to create a config module. Just import the config module in all modules of your application; the module then becomes available as a global name. Hope it works!!
So you can make the variable a module-level variable in whatever module it makes sense to put it in, and access it or assign to it from other modules. It would be better to call a function to set the variable's value, or to make it a property of some singleton object.
To use global variables between files in Python, we can use the global keyword to define a global variable in a module file. Then we can import the module in another module and reference the global variable directly. We import the settings and subfile modules in main.py . Then we call settings.
If you need a global cross-module variable maybe just simple global module-level variable will suffice.
a.py:
var = 1 b.py:
import a print a.var import c print a.var c.py:
import a a.var = 2 Test:
$ python b.py # -> 1 2 Real-world example: Django's global_settings.py (though in Django apps settings are used by importing the object django.conf.settings).
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