use tripple quote in generated code to be even more robust

asyncua/common/structures104.py

@@ -176,7 +176,7 @@ class {struct_name}{base_class}:
     {struct_name} structure autogenerated from StructureDefinition object
     '''
 
-    data_type = ua.NodeId.from_string('{data_type.to_string()}')
+    data_type = ua.NodeId.from_string('''{data_type.to_string()}''')
 
 """
 

tests/test_common.py

@@ -1576,11 +1576,12 @@ async def test_alias(opc):
     await var.write_value(v)
     val = await var.read_value()
 
+
 async def test_custom_struct_with_strange_chars(opc):
     idx = 4
 
     await new_struct(opc.opc, ua.StringNodeId('Toto"æ', 99), ua.QualifiedName("Siemens", 99), [
-        new_struct_field("MyBool", ua.VariantType.Boolean),
+        new_struct_field('MyBool', ua.VariantType.Boolean),
         new_struct_field("MyUInt32", ua.VariantType.UInt32, array=True),
     ])