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python - 如何将测试输出打印到pyqt gui中的标签

问题描述

我想用 python 脚本做什么：使用 pytest 测试方法将文本行打印到 pyqt GUI 中的标签。

当运行主要的 python 文件时，GUI 启动并且单击“测试”按钮运行测试而不阻塞 GUI（参见下面的完整代码示例）。但我不知道现在如何进行。

代码：

import sys

import pytest
from PyQt5 import QtWidgets, QtCore
from PyQt5.QtWidgets import QApplication, QVBoxLayout, QWidget


class Window(QtWidgets.QMainWindow):
    signal_start_background_job = QtCore.pyqtSignal()

    def __init__(self):
        super(Window, self).__init__()

        layout = QVBoxLayout()
        self.button = QtWidgets.QPushButton("test", self)
        self.label = QtWidgets.QLabel("console output")
        layout.addWidget(self.button)
        layout.addWidget(self.label)
        widget = QWidget()
        widget.setLayout(layout)
        self.setCentralWidget(widget)

        self.worker = WorkerObject()
        self.thread = QtCore.QThread()
        self.worker.moveToThread(self.thread)

        self.signal_start_background_job.connect(self.worker.background_job)
        self.button.clicked.connect(self.start_background_job)

    def start_background_job(self):
        self.thread.start()
        self.signal_start_background_job.emit()


class WorkerObject(QtCore.QObject):
    @QtCore.pyqtSlot()
    def background_job(self):
        pytest.main(["-s", "-k test_something"])


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())


def test_something():
    print("unit test some stuff")
    assert 0 == 0

标签： pythonpyqt

解决方案

您可以使用 QProcess 启动它，然后捕获输出，而不是直接使用 pytest：

import os
import sys

from PyQt5 import QtWidgets, QtCore
from PyQt5.QtWidgets import QApplication, QVBoxLayout, QWidget

CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))


class Window(QtWidgets.QMainWindow):
    def __init__(self):
        super(Window, self).__init__()

        self.button = QtWidgets.QPushButton("test", self)
        self.label = QtWidgets.QLabel("console output")
        self.textedit = QtWidgets.QTextEdit(readOnly=True)

        widget = QWidget()
        layout = QVBoxLayout(widget)
        layout.addWidget(self.button)
        layout.addWidget(self.label)
        layout.addWidget(self.textedit)
        self.setCentralWidget(widget)

        self.process = QtCore.QProcess()
        self.process.setProgram(sys.executable)
        self.process.readyReadStandardError.connect(self.on_readyReadStandardError)
        self.process.readyReadStandardOutput.connect(self.on_readyReadStandardOutput)

        self.button.clicked.connect(self.on_clicked)

    @QtCore.pyqtSlot()
    def on_clicked(self):
        self.process.setWorkingDirectory(CURRENT_DIR)
        self.process.setArguments(["-m", "pytest", "-s", "-k", "test_something"])
        self.process.start()

    @QtCore.pyqtSlot()
    def on_readyReadStandardError(self):
        err = self.process.readAllStandardError().data().decode()
        self.textedit.append(err)

    @QtCore.pyqtSlot()
    def on_readyReadStandardOutput(self):
        out = self.process.readAllStandardOutput().data().decode()
        self.textedit.append(out)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

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