Embedded matplotlib inside Qt5 C++

file.pro

######################################################################
# Automatically generated by qmake (3.1) Mon Sep 13 15:29:11 2021
######################################################################

TEMPLATE = app
TARGET = embedded
INCLUDEPATH += .
INCLUDEPATH += /home/yudha/Miniconda/envs/pyqt5/include/python3.9

# The following define makes your compiler warn you if you use any
# feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

# Input
SOURCES += main.cpp

QT += widgets

LIBS += -Wl,-rpath,/home/yudha/Miniconda/envs/pyqt5/lib/python3.9/lib-dynload -Wl,-rpath,/usr/lib/x86_64-linux-gnu -Wl,-rpath,/home/yudha/Miniconda/envs/pyqt5/lib -L/home/yudha/Miniconda/envs/pyqt5/lib -lpython3.9

CONFIG += no_keywords

matplotlibinqt5.cpp

#include <QApplication>
#include <QMainWindow>

#include <iostream>
#include <Python.h>

class PythonQt
{

public:

  PythonQt()
  {
    wchar_t const name[] = L"test";
    Py_SetProgramName(name);
    Py_Initialize();

    std::string code =
        "import sys\n"
        "sys.path += [\"/home/yudha/Miniconda/envs/pyqt5/lib/python3.9/lib-dynload\"]\n"
        // "print('\\n'.join(sys.path))\n";
        "import matplotlib\n"
        "matplotlib.use('Qt5Agg')\n"
        ""
        "from PyQt5 import QtCore, QtWidgets\n"
        ""
        "from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg\n"
        "from matplotlib.figure import Figure\n"
        ""
        ""
        "class MplCanvas(FigureCanvasQTAgg):\n"
        "   def __init__(self, parent=None, width=5, height=4, dpi=100):\n"
        "       fig = Figure(figsize=(width, height), dpi=dpi)\n"
        "       self.axes = fig.add_subplot(111)\n"
        "       super(MplCanvas, self).__init__(fig)\n"
        ""
        "all_widgets = QtWidgets.QApplication.instance().allWidgets()\n"
        "window = None\n"
        "for widget in all_widgets:\n"
        "    if str(widget.objectName()) == \"main_window\":\n"
        "      window = widget\n"
        "      break\n"
        ""
        "#def message_box():\n"
        "#    QtWidgets.QMessageBox.information(None, 'Test', 'Hello!', QtWidgets.QMessageBox.Ok)\n"
        "#    QtWidgets.QApplication.instance().quit()\n"
        ""
        "#button = QtWidgets.QPushButton('Press Me')\n"
        "#button.clicked.connect(message_box)\n"
        "sc = MplCanvas(window, width=5, height=4, dpi=100)\n"
        "sc.axes.plot([0,1,2,3,4], [10,1,20,3,40])\n"
        "window.setCentralWidget(sc)\n"
        "window.move(600, 300)";

    PyRun_SimpleString(code.c_str());
  }

};

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  QMainWindow win;
  win.setObjectName("main_window");

  PythonQt python_code;

  win.show();

  return a.exec();
}