Change global variable across class in python -

i trying make change global variable across classes. here code:

file main.py

import class2  class first:     def changea(self):         global         print         += 2         print  test0 = first() test1 = class2.second() test2 = first() test3 = class2.second() test0.changea() test1.changea() test2.changea() test3.changea() 

file class2.py

a = 1  class second:     def changea(self):         global         print         += 1         print 

but returns error: global name 'a' not defined. there proper way access , change global variable across files in python? in advance

global variables don't exist in python.

the global statement misnomed statement. means variable module's variable. there no such thing global namespace in python.

if want modify variable multiple modules must set attribute:

import module  module.variable = value 

doing simple assignment create or modify module's variable. code

from module import variable  variable = value 

simply shadows value of variable imported module creating new binding identifier module's variable value not changed.

in summary: no there no way achieve want (although want bad practice anyway, , should try use different solution).