[feature] override a function regionally by adding a decorator

erpnext/tests/test_regional.py

@@ -0,0 +1,13 @@
+import unittest, frappe, erpnext
+
+@erpnext.regional
+def test_method():
+	return 'original'
+
+class TestInit(unittest.TestCase):
+	def test_regional_overrides(self):
+		frappe.flags.country = 'India'
+		self.assertEqual(test_method(), 'overridden')
+
+		frappe.flags.country = 'Nepal'
+		self.assertEqual(test_method(), 'original')