problem

QChartView Add in QGridLayout The previous control is overwritten when in , Display only QChart

import sys
from random import uniform, random

from PySide2.QtCharts import QtCharts
from PySide2.QtCore import QPointF
from PySide2.QtGui import QPainter
from PySide2.QtWidgets import QWidget, QGridLayout, QApplication


class MainWidget(QWidget):
    def __init__(self):
        super(MainWidget, self).__init__()
        self.main_layout = QGridLayout()
        self.setLayout(self.main_layout)
        widegt1 = QWidget()
        widegt1.setStyleSheet("background-color: red")
        widget2 = QWidget()
        widget2.setStyleSheet("background-color: red")
        self.main_layout.addWidget(widegt1, 0, 0, 3, 2)
        self.main_layout.addWidget(widget2, 0, 2, 2, 1)

        self.list_count = 3
        self.value_max = 10
        self.value_count = 7
        self.data_table = self.generate_random_data(self.list_count,
                                                    self.value_max, self.value_count)

        chart_view = QtCharts.QChartView(self.createSplineChart())
        chart_view.setRenderHint(QPainter.Antialiasing)
        self.main_layout.addWidget(chart_view, 2, 2, 1, 1)
        # self.main_layout.setColumnStretch(0, 1)
        # self.main_layout.setColumnStretch(1, 1)
        # self.main_layout.setColumnStretch(2, 1)
        # self.main_layout.setRowStretch(0, 1)
        # self.main_layout.setRowStretch(1, 1)
        # self.main_layout.setRowStretch(2, 1)

    def createSplineChart(self):
        chart = QtCharts.QChart()
        chart.setTitle("Spline chart")
        name = "Series "
        for i, lst in enumerate(self.data_table):
            series = QtCharts.QSplineSeries(chart)
            for data in lst:
                series.append(data[0])
            series.setName("{}{}".format(name, i))
            chart.addSeries(series)

        chart.createDefaultAxes()
        chart.axisX().setRange(0, self.value_max)
        chart.axisY().setRange(0, self.value_count)
        # Add space to label to add space between labels and axis
        chart.axisY().setLabelFormat("%.1f ")

        return chart

    def generate_random_data(self, list_count, value_max, value_count):
        data_table = []
        for i in range(list_count):
            data_list = []
            y_value = 0
            for j in range(value_count):
                constant = value_max / float(value_count)
                y_value += uniform(0, constant)
                x_value = (j + random()) * constant
                value = QPointF(x_value, y_value)
                label = "Slice {}: {}".format(i, j)
                data_list.append((value, label))
            data_table.append(data_list)

        return data_table


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWidget()
    # available_geometry = app.desktop().availableGeometry(window)
    # size = available_geometry.height() * 0.75
    # window.resize(size, size * 0.8)
    window.show()
    sys.exit(app.exec_())

terms of settlement

Set the proportion of each column and row
Add the following code ：

		self.main_layout.setColumnStretch(0, 1)
        self.main_layout.setColumnStretch(1, 1)
        self.main_layout.setColumnStretch(2, 1)
        self.main_layout.setRowStretch(0, 1)
        self.main_layout.setRowStretch(1, 1)
        self.main_layout.setRowStretch(2, 1)