add a way to exchange variables between modules

backend/shared.py

@@ -0,0 +1,9 @@
+class VariableHolder:
+    def __setattr__(self, name, value):
+        self.__dict__[name] = value
+
+    def __getattr__(self, name):
+        return self.__dict__.get(name, None)
+
+
+global_variables = VariableHolder()