How to declare a global variable from within a class?

Question

I'm trying to declare a global variable from within a class like so:

class myclass:
    global myvar = 'something'

I need it to be accessed outside the class, but I don't want to have to declare it outside the class file. My question is, is this possible? If so, what is the syntax?

Answer 1

In your question, you specify "outside the main file". If you didn't mean "outside the class", then this will work to define a module-level variable:

myvar = 'something'

class myclass:
    pass

Then you can do, assuming the class and variable definitions are in a module called mymodule:

import mymodule

myinstance = myclass()
print mymodule.myvar 

Also, in response to your comment on @phihag's answer, you can access myvar unqualified like so:

from mymodule import myvar

print myvar

If you want to just access it shorthand from another file while still defining it in the class:

class myclass:
    myvar = 'something'

then, in the file where you need to access it, assign a reference in the local namespace:

myvar = myclass.myvar

print myvar