PyQt5: Updating Label?

Question

I\'m currently having trouble updating labels continuously, I have tried my different ways but either nothing happens or the program stops working. I have attached below pa

Answer 1

To implement the code we will do the following:

1. To update the time we use a timer.
2. To obtain the weather data, we use the pyowm library.
3. The task of obtaining the weather can block the main thread of the GUI, therefore we will create a Thread.
4. Within the thread we will create a signal that will store the weather information and connect it to the main thread via the updateTemp slot.

---

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("ffffd 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")

Thread:

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)

About the question: could explain exactly the purpose of def retranslateUi(self, MainWindow)?

This serves to make translatable into several languages, for example the same code could be used for an audience that speaks English, Spanish, German, etc. For your purposes it is not necessary.

Complete code:

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("ffffd 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_())

Answer 2

Here is a small working example that should help you. QTimer is used for periodical calling the update_labelTime function.

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_())

P.S. Don't forget to change the updating period in timer.start call