在現有主窗口上顯示在 PyQt GUI 上選擇組合框選項的圖形

Question

所以我試圖基本上設置某種工具，它允許我從數據框中選擇一列，當我從組合框中選擇該列時，顯示該列分布的圖形應該顯示在同一個窗口中。 我不知道如何處理這個...

這是我的組合框的外觀：

我需要能夠在同一窗口中顯示圖形（分布）。

我該怎么做？

Answer 1

下面是一個示例，用於說明如何使用組合框在同一窗口中的數據框中繪制列中的數據。

from PyQt5 import QtWidgets
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
import matplotlib.pyplot as plt
import pandas as pd
import os

class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.combo = QtWidgets.QComboBox()
        self.combo.addItem("Choose a field")
        self.button = QtWidgets.QPushButton('Read csv file')

        # axes and widget for plotting and displaying the figure
        self.fig, self.ax = plt.subplots()
        self.figure_widget = FigureCanvas(self.fig)
        plt.tight_layout()

        # set up layout
        vlayout = QtWidgets.QVBoxLayout(self)
        hlayout = QtWidgets.QHBoxLayout()
        hlayout.addWidget(self.combo)
        hlayout.addWidget(self.button)
        hlayout.addStretch(2)
        vlayout.addLayout(hlayout)
        vlayout.addWidget(self.figure_widget)

        self.button.clicked.connect(self.read_data)
        self.combo.currentTextChanged.connect(self.field_changed)

    def read_data(self):
        dialog = QtWidgets.QFileDialog(self, directory=os.curdir, caption='Open data file' )
        dialog.setAcceptMode(QtWidgets.QFileDialog.AcceptOpen)
        dialog.setFileMode(QtWidgets.QFileDialog.ExistingFile)
        if dialog.exec():
            # read data and add columns to combo box
            file = dialog.selectedFiles()[0]
            self.data = pd.read_csv(file)
            self.combo.clear()
            self.combo.addItem("Choose a field")
            for field in self.data.columns:
                self.combo.addItem(field)
            self.combo.setCurrentIndex(0)

    def field_changed(self, field):
        self.ax.clear()
        if field in self.data.columns:
            self.data.plot(y=field, ax=self.ax)
            self.ax.set_ylabel(field)
            self.ax.set_xlabel('index')
        plt.tight_layout()
        self.fig.canvas.draw()


if __name__ == '__main__':
    app = QtWidgets.QApplication([])
    widget = Widget()
    widget.show()
    app.exec()