Python PyQt5:更新标签？

我目前无法持续更新标签，我尝试了不同的方法，但要么什么都没有发生，要么程序停止工作。我在下面附上了我的部分代码。我还希望有人能准确地解释def重新传输的目的（self，main window）：

---

我想得到的标签，目前的时间保持更新和调用天气api发生大约每5分钟。任何帮助是非常感谢

下面是一个小的工作示例，应该对您有所帮助

QTimer

用于定期调用

update\u labelTime

函数

import sys
from PyQt5.QtCore import QTimer, QTime
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel

class MyApp(QMainWindow):
    def __init__(self):
        super(MyApp, self).__init__()

        self.labelTime = QLabel()
        self.update_labelTime()
        self.setCentralWidget(self.labelTime)

        self.timer = QTimer()
        self.timer.timeout.connect(self.update_labelTime)
        self.timer.start(1000) # repeat self.update_labelTime every 1 sec

    def update_labelTime(self):

        time_str = "Current time: {0}".format(QTime.currentTime().toString())
        self.labelTime.setText(time_str)

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

---

注意：不要忘记更改

计时器中的更新周期。启动

调用

要实现代码，我们将执行以下操作：

为了更新时间，我们使用计时器

为了获得天气数据，我们使用图书馆

获取天气的任务可能会阻塞GUI的主线程，因此我们将创建一个线程

在该线程中，我们将创建一个信号来存储天气信息，并通过updateTemp插槽将其连接到主线程

---

线程：

class PyownThread(QtCore.QThread):
    tempSignal = QtCore.pyqtSignal(dict)
    def __init__(self, parent=None):
        super(PyownThread, self).__init__(parent=parent)
        self.owm = pyowm.OWM('1589dbcc0e9608e5b70f0ede23e757c8')


    def run(self):
        while True:
            observation = self.owm.weather_at_place('New York,us')
            w = observation.get_weather()
            ctemp = w.get_temperature('celsius')
            self.tempSignal.emit(ctemp)
            self.sleep(5*60)

关于问题：能否准确解释def重新传输的目的（自我，主窗口）

这有助于将代码翻译成多种语言，例如，同一代码可用于说英语、西班牙语、德语等的受众。出于您的目的，这是不必要的

完整代码：

from PyQt5 import QtWidgets, QtGui, QtCore
import pyowm


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("Tom")
        MainWindow.setWindowModality(QtCore.Qt.NonModal)
        MainWindow.resize(800, 600)
        MainWindow.setAutoFillBackground(False)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.Date = QtWidgets.QLabel(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(18)
        self.Date.setFont(font)
        self.Date.setAlignment(QtCore.Qt.AlignCenter)
        self.Date.setObjectName("Date")
        self.verticalLayout.addWidget(self.Date)
        self.Time = QtWidgets.QLabel(self.centralwidget)

        self.verticalLayout.addWidget(self.Time)
        self.Weather = QtWidgets.QLabel(self.centralwidget)
        self.Weather.setAlignment(QtCore.Qt.AlignCenter)
        self.Weather.setWordWrap(False)
        self.Weather.setObjectName("Weather")
        self.verticalLayout.addWidget(self.Weather)
        spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem)
        spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem1)
        spacerItem2 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem2)
        spacerItem3 = QtWidgets.QSpacerItem(771, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem3)
        spacerItem4 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem4)
        spacerItem5 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem5)
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("Tom", "Tom"))
        self.Date.setText(_translate("Tom", "Today is "))
        self.Time.setText(_translate("Tom", "It is currently "))
        self.Weather.setText(_translate("Tom", "New York City" ))


class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent=parent)
        self.setupUi(self)
        timerTime = QtCore.QTimer(self)
        timerTime.timeout.connect(self.updateDate)
        timerTime.start(1000)
        self.pyowm = PyownThread(self)
        self.pyowm.tempSignal.connect(self.updateTemp)
        self.pyowm.start()

    def updateDate(self):
        date = QtCore.QDateTime.currentDateTime()
        self.Date.setText("Today is " + date.toString("ddd MMMM d yyyy"))
        self.Time.setText("It is currently " + date.toString("hh:mm:ss ap"))

    def updateTemp(self, temp):
        self.Weather.setText("New York City temperature:" + str(temp['temp']) + " \u00B0C")


class PyownThread(QtCore.QThread):
    tempSignal = QtCore.pyqtSignal(dict)
    def __init__(self, parent=None):
        super(PyownThread, self).__init__(parent=parent)
        self.owm = pyowm.OWM('1589dbcc0e9608e5b70f0ede23e757c8') 

    def run(self):
        while True:
            observation = self.owm.weather_at_place('New York,us')
            w = observation.get_weather()
            ctemp = w.get_temperature('celsius')
            self.tempSignal.emit(ctemp)
            QtCore.QThread.sleep(5*60)



if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

---

您是否尝试过使用QTimer？如果你提供了所有需要导入的工作示例，我会尽力帮助你。非常感谢你，这真的帮助我理解了计时器是如何更新所有内容的！

class PyownThread(QtCore.QThread):
    tempSignal = QtCore.pyqtSignal(dict)
    def __init__(self, parent=None):
        super(PyownThread, self).__init__(parent=parent)
        self.owm = pyowm.OWM('1589dbcc0e9608e5b70f0ede23e757c8')


    def run(self):
        while True:
            observation = self.owm.weather_at_place('New York,us')
            w = observation.get_weather()
            ctemp = w.get_temperature('celsius')
            self.tempSignal.emit(ctemp)
            self.sleep(5*60)

from PyQt5 import QtWidgets, QtGui, QtCore
import pyowm


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("Tom")
        MainWindow.setWindowModality(QtCore.Qt.NonModal)
        MainWindow.resize(800, 600)
        MainWindow.setAutoFillBackground(False)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.Date = QtWidgets.QLabel(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(18)
        self.Date.setFont(font)
        self.Date.setAlignment(QtCore.Qt.AlignCenter)
        self.Date.setObjectName("Date")
        self.verticalLayout.addWidget(self.Date)
        self.Time = QtWidgets.QLabel(self.centralwidget)

        self.verticalLayout.addWidget(self.Time)
        self.Weather = QtWidgets.QLabel(self.centralwidget)
        self.Weather.setAlignment(QtCore.Qt.AlignCenter)
        self.Weather.setWordWrap(False)
        self.Weather.setObjectName("Weather")
        self.verticalLayout.addWidget(self.Weather)
        spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem)
        spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem1)
        spacerItem2 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem2)
        spacerItem3 = QtWidgets.QSpacerItem(771, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem3)
        spacerItem4 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem4)
        spacerItem5 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem5)
        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("Tom", "Tom"))
        self.Date.setText(_translate("Tom", "Today is "))
        self.Time.setText(_translate("Tom", "It is currently "))
        self.Weather.setText(_translate("Tom", "New York City" ))


class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent=parent)
        self.setupUi(self)
        timerTime = QtCore.QTimer(self)
        timerTime.timeout.connect(self.updateDate)
        timerTime.start(1000)
        self.pyowm = PyownThread(self)
        self.pyowm.tempSignal.connect(self.updateTemp)
        self.pyowm.start()

    def updateDate(self):
        date = QtCore.QDateTime.currentDateTime()
        self.Date.setText("Today is " + date.toString("ddd MMMM d yyyy"))
        self.Time.setText("It is currently " + date.toString("hh:mm:ss ap"))

    def updateTemp(self, temp):
        self.Weather.setText("New York City temperature:" + str(temp['temp']) + " \u00B0C")


class PyownThread(QtCore.QThread):
    tempSignal = QtCore.pyqtSignal(dict)
    def __init__(self, parent=None):
        super(PyownThread, self).__init__(parent=parent)
        self.owm = pyowm.OWM('1589dbcc0e9608e5b70f0ede23e757c8') 

    def run(self):
        while True:
            observation = self.owm.weather_at_place('New York,us')
            w = observation.get_weather()
            ctemp = w.get_temperature('celsius')
            self.tempSignal.emit(ctemp)
            QtCore.QThread.sleep(5*60)



if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())