How to duplicate Layout PyQt5 QGIS 3?

Question

I want script in python3 with QGIS 3?

For example:

This code create a layout 2019_A4 and add Layout Manager. I need a code make same in QGIS3 using QgsLayoutManager with Methods duplicateLayout

Here: https://qgis.org/pyqgis/3.4/core/QgsLayoutManager.html

from qgis.PyQt.QtCore import *
from qgis.core import *

# A Project, Manager, & PrintLayout Classes
project = QgsProject.instance()
manager = project.layoutManager()
# layout = QgsPrintLayout(project)
layout = manager.layoutByName("2019_A4")
#layout.initializeDefaults()
#layout.setName('2019_A')
manager.addLayout(layout)

Answer 1

With just this line of code, it's working fine for me :

layout_bis = manager.duplicateLayout(layout, '2019_A_bis')