python: 'sub-module' for binding sources and documentation meta information

modules/python/src2/gen2.py

@@ -46,20 +46,7 @@ gen_template_func_body = Template("""$code_decl
     }
 """)
 
-py_major_version = sys.version_info[0]
-if __name__ == "__main__":
-    if len(sys.argv) > 3:
-        if sys.argv[3] == 'PYTHON3':
-            py_major_version = 3
-        elif sys.argv[3] == 'PYTHON2':
-            py_major_version = 2
-        else:
-            raise Exception('Incorrect argument: expected PYTHON2 or PYTHON3, received: ' + sys.argv[3])
-if py_major_version >= 3:
-    head_init_str = "PyVarObject_HEAD_INIT(&PyType_Type, 0)"
-else:
-    head_init_str = """PyObject_HEAD_INIT(&PyType_Type)
-0,"""
+head_init_str = "CV_PYTHON_TYPE_HEAD_INIT()"
 
 gen_template_simple_type_decl = Template("""
 struct pyopencv_${name}_t