问题
I investigated that scope of global variables in python is limited to the module. But I need the scope to be global among different modules. Is there such a thing? I played around __builtin__ but no luck.
thanks in advance!
回答1:
You can access global variables from other modules by importing them explicitly.
In module foo:
joe = 5
In module bar:
from foo import joe
print joe
Note that this isn't recommended, though. It's much better to hide access to a module's variables by using functions.
回答2:
Python does not support globals shared between several modules: this is a feature. Code that implicitly modifies variables used far away is confusing and unmaintainable. The real solution is to encapsulate all state within a class and pass its instance to anything that has to modify it. This can make code clearer, more maintainable, more testable, more modular, and more expendable.
回答3:
Scopes beyond the local must be written to via a reference to the scope, or after a global or nonlocal (3.x+) directive.
来源：https://stackoverflow.com/questions/2296550/how-to-have-global-variables-among-different-modules-in-python