如何在pyqt中用数据快速填充QTableView/Model

Question

我正在寻找一种在 python 中用超过 10000 行数据填充 QTableModel 的快速方法。

在双 for 循环中迭代项目需要 40 多秒。

Answer 1

我建议创建 QStandardItem 的 numpy 数组并使用 appendColumn 函数填充模型：

start = time.time()
data = np.empty(rows, cols, dtype=object)              # generate empty data-Array

#### Fill the data array with strings here ###

items = np.vectorize(QStandardItem)(data)              # generate QStandardItem-Array
print(time.time() - start, "seconds to create items")

start = time.time()
# iterate over columns (because we have segneficantly less columns than rows)
for i in range(len(cols)): 
    self.myQTableModel.appendColumn(items[:,i])

self.myQTableModel.setHorizontalHeaderLabels(headerarray)    # set headers
print(time.time()-start, "seconds to load DB")

16000 行和 7 列的结果：

0.346372127532959 seconds to create items
1.1745991706848145 seconds to load DB

Answer 2

您不需要显式地将项目添加到 QTableModel，您可以围绕现有数据结构构建自己的模型，例如列表列表或如下所示的 numpy 数组。

from PyQt5 import QtWidgets, QtCore, QtGui
import sys
from PyQt5.QtCore import QModelIndex, Qt
import numpy as np

class MyTableModel(QtCore.QAbstractTableModel):
    def __init__(self, data=[[]], parent=None):
        super().__init__(parent)
        self.data = data

    def headerData(self, section: int, orientation: Qt.Orientation, role: int):
        if role == QtCore.Qt.DisplayRole:
            if orientation == Qt.Horizontal:
                return "Column " + str(section)
            else:
                return "Row " + str(section)

    def columnCount(self, parent=None):
        return len(self.data[0])

    def rowCount(self, parent=None):
        return len(self.data)

    def data(self, index: QModelIndex, role: int):
        if role == QtCore.Qt.DisplayRole:
            row = index.row()
            col = index.column()
            return str(self.data[row][col])


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)

    # data = [[11, 12, 13, 14, 15],
    #         [21, 22, 23, 24, 25],
    #         [31, 32, 33, 34, 35]]

    data = np.random.random((10000, 100)) * 100

    model = MyTableModel(data)
    view = QtWidgets.QTableView()
    view.setModel(model)

    view.show()

    sys.exit(app.exec_())

如何在pyqt中用数据快速填充QTableView/Model

How to quickly fill a QTableView/Model with data in pyqt

python

pyqt

qtableview